So, being that I am a player, I do not have access to logs and level.dat files and stuff, but I can provide evidence from what I do know and what I can see. So, on FTB Revelations (A modpack including this mod)
is the latest version of Quark. MYM is running a server with this pack, and everything was smooth sailing post-reset. However, after a server restart occured, many blocks from a multitude of mods (Extreme Reactors, Forestry, Torch Master, etc.) misplaced ID's, leaving the world scattered with many extremities (Actually Additions block breakers and player interfaces in place of bee hives, Forestry trees being converted to doors and other crazy things, etc.) While this may seem unrelated, I'm getting to it. An item in your mod, a curse potion (From what I understand, it's called Soul Bead) somehow causes issues with world registry data. You can see the post here: https://media.discordapp.net/attachments/278282627373465600/431589162043441152/unknown.png?width=863&height=474
(This is a screenshot someone else took of this post)
Again, this is evidence I myself and others have gathered, and we're not entirely sure as we've not gotten a response from related staff yet. Waiting on them to do a controlled test.

Yeah, I've seen something like this before with my own pack after random mod updates. The best thing I'd say is to use a map backup if it's available. After jumping to a map backup, the issue with block ID mishaps seemed to vanish. I have no clue what causes it, but that's what I've found to fix the issue.