We had a lot of trouble getting support to help with this.. After a couple months I finally dove into the Orion database and fixed the issue. I wanted to share the cause and the fix in case anyone else is search this. I have found a lot of data over the years in these tables that should have been deleted, but wasn't. Support never has an answer.
The table is vim_virtualmachines
Look for the affected VM,
select * from vim_virtualmachines where name = 'vm-name'
If the VM has no snapshots, look for these values,
SnapshotStorageSize should be 0
snapshotsummarycount should be 0
snapshotdatemodifed should be NULL
oldestnsapshotdate should be NULL
You can fix the issue by running this.
UPDATE vim_virtualmachines SET SnapshotStorageSize = 0, snapshotsummarycount = 0, snapshotdatemodifed = NULL, oldestnsapshotdate = NULL where name = 'vm-name'