Log messages in web.log "Can't find category for node"

Recently we notice a flood of errors in the opennms web.log as below. But we don’t monitor any windows nodes on that opennms, so wondering whats happening here and how to go about it?

OpenNMS version:

Can't find category Microsoft for node 53.

Was someone doing something they shouldn’t in the database, such as deleting categories or inserting nodes?

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Thanks for the reply, but there aren’t any windows node on this opennms. We add nodes thru a requisition. But I did notice this error across all our non windows opennms. Its nothing serious I hope.