It's actually the other way around. When we first moved to this new platform, there were a bunch of duplicate posts in our database that we'd been using for testing. Those were deleted, but the post counts still retained the values for the deleted posts. We ran an update yesterday that re-indexed all the posts and updated all the counts. My count went from 26,000 down to way below that. Most others also dropped, but a few went up. HOwever, in looking, it looks like some of the numbers might be low. I'll ask our software engineer to look at it again.
This is an issue our software engineer is still working on. May be a week or two before it's properly fixed (it's both time- and resource-consuming for the server to reindex all the posts, and a pretty low priority on his list.)