The indexes for your services may be corrupt or out of sync.  There's a number of reasons that can happen that I won't speculate on here.

Make a copy of your database and perform a purge/compact on it. That should re-sequence the table index.  At this point, review your services (all of them) and make sure they are still using the proper templates. 

Not really a solution as a way to test and fix a possible indexing problem.