Thanks for the links. If there was a big recount, then apparently this is a very rare occurrence, because in almost 4 years of my active presence on the forum, for the first time I encountered such phenomena that a bunch of posts simply disappeared.
This issue happened to me few times before and I couldn't explain how it happened exactly.
I never cared about that so much but I noticed this difference in campaign spreadsheet and I couldn't find the real reason, that was probably related with some older topics and topics, and maybe previously deleted posts are the real reason.
Note that I never checked if BPIP and Ninjastic websites are showing the same number of posts or not.