"Hogan (US), Michael C" Michael.C.Hogan2@boeing.com writes:
It may matter that we're running the wiki on two servers, using Percona MySQL for data replication between the servers.
I'm guessing that this is the cause.
If you're using the XtraDB Cluster, you have probably set PXC Strict Mode to permissive or disabled it and, as a result, there is some inconsistency between the two databases.
Mark.