IpNetToMedia Table: Manage duplicated ip address

I'm getting these error in hibernate.log:

FYI: "ERRO: duplicar valor da chave viola a restri??o de unicidade "pk_atinterface" means "ERROR: duplicating the key value violates the restriction "pk_atinterface""

2014-10-26 15:33:59,426 WARN [Scheduler-Thread-2-of-5] JDBCExceptionReporter: SQL Error: 0, SQLState: 23505
2014-10-26 15:33:59,426 ERROR [Scheduler-Thread-2-of-5] JDBCExceptionReporter: ERRO: duplicar valor da chave viola a restri??o de unicidade "pk_atinterface"
Detail: Chave (nodeid, ipaddr, atphysaddr)=(15, 10.9.0.1, 001ebd44416b) j? existe.
2014-10-26 15:33:59,426 ERROR [Scheduler-Thread-2-of-5] AbstractFlushingEventListener: Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: could not update: org.opennms.netmgt.model.OnmsAtInterface#44731
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2453)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635)
at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:64)
at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:996)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1589)
at sun.reflect.GeneratedMethodAccessor552.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:618)
at org.springframework.orm.hibernate3.HibernateTemplate$CloseSuppressingInvocationHandler.invoke(HibernateTemplate.java:1282)
at com.sun.proxy.$Proxy87.list(Unknown Source)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
at org.opennms.netmgt.dao.hibernate.AbstractDaoHibernate$7.doInHibernate(AbstractDaoHibernate.java:369)
at org.opennms.netmgt.dao.hibernate.AbstractDaoHibernate$7.doInHibernate(AbstractDaoHibernate.java:364)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.executeFind(HibernateTemplate.java:343)
at org.opennms.netmgt.dao.hibernate.AbstractDaoHibernate.findMatching(AbstractDaoHibernate.java:372)
at org.opennms.netmgt.dao.hibernate.AtInterfaceDaoHibernate.findByNodeAndAddress(AtInterfaceDaoHibernate.java:164)
at org.opennms.netmgt.dao.hibernate.AtInterfaceDaoHibernate$1.query(AtInterfaceDaoHibernate.java:178)
at org.opennms.netmgt.dao.hibernate.AtInterfaceDaoHibernate$1.query(AtInterfaceDaoHibernate.java:174)
at org.opennms.netmgt.dao.support.UpsertTemplate.doUpsert(UpsertTemplate.java:157)
at org.opennms.netmgt.dao.support.UpsertTemplate.access$000(UpsertTemplate.java:123)
at org.opennms.netmgt.dao.support.UpsertTemplate$1.doInTransaction(UpsertTemplate.java:147)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.opennms.netmgt.dao.support.UpsertTemplate.execute(UpsertTemplate.java:143)
at org.opennms.netmgt.dao.hibernate.AtInterfaceDaoHibernate.saveAtInterface(AtInterfaceDaoHibernate.java:174)
at org.opennms.netmgt.linkd.AbstractQueryManager.processIpNetToMediaTable(AbstractQueryManager.java:196)
at org.opennms.netmgt.linkd.HibernateEventWriter.storeSnmpCollection(HibernateEventWriter.java:224)
at org.opennms.netmgt.linkd.HibernateEventWriter$$FastClassByCGLIB$$3a4c15a2.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
at org.opennms.netmgt.linkd.HibernateEventWriter$$EnhancerByCGLIB$$abb225b5.storeSnmpCollection(<generated>)
at org.opennms.netmgt.linkd.Linkd.updateNodeSnmpCollection(Linkd.java:757)
at org.opennms.netmgt.linkd.SnmpCollection.runCollection(SnmpCollection.java:681)
at org.opennms.netmgt.linkd.SnmpCollection.run(SnmpCollection.java:390)
at org.opennms.netmgt.linkd.scheduler.Scheduler$1.run(Scheduler.java:203)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:626)
at org.opennms.core.concurrent.LogPreservingThreadFactory$3.run(LogPreservingThreadFactory.java:107)
at java.lang.Thread.run(Thread.java:804)

Searching in the table, I noticed that there is already an atinterface for it. In fact, there is multiple entries!

id | nodeid | ipaddr | atphysaddr | status | sourcenodeid | ifindex | lastpolltime
----------------------------------------------------------+------------------------
44731 | 15 | 10.9.0.1 | 001ebd444140 | N | 51 | 2 | 2010-11-24 14:03:26.513
91332 | 15 | 10.9.0.1 | 001ebd44415f | N | 15 | 1000 | 2012-12-02 06:59:38.226
112773 | 15 | 10.9.0.1 | 001ebd444168 | N | 15 | 1000 | 2013-05-25 08:53:05.874
131189 | 15 | 10.9.0.1 | 001ebd444169 | N | 15 | 1000 | 2013-09-24 18:00:05.241
135124 | 15 | 10.9.0.1 | 001ebd44416b | N | 197 | 65539 | 2014-01-26 19:21:13.831

The current mac matches the last line. I just don't know why the sourceid is 197, a simple windows server node, and not 15 as the others. Also the ifindex is 1000, not 65539.

Why this happened? And how can I clean up my database?