This wasn't happening at first, but I first started noticing it after I went to the Nether for the first time. I was in bat form, and after going through, my health reset to player normal. Several morphs later, I noticed I had excess hearts. I assumed it was part of another mod, and was going to look into it later. I first started noticing it being directly connected to Metamorph after I started transforming into a Ghast and back. Morphing back and forth to up my health intentionally, it got all the way to blue hearts

mods.txt
config.zip

Using Forge 2739 & 2747

Seems to be doing the increases in increments of 8, fwiw

Server restart resets it, may be client desync

Might be, is there anything in the logs? Like some kind of exception?

Update, it retained it after relogging, but without the server restarting. If there's anything logged in regards to this, it will be in one of these three server logs.
2018-08-09-3.log.gz
2018-08-10-1.log.gz
2018-08-10-2.log.gz

Doesn't appear to be, but you can view for yourself. It definitely occurred in this run of the pack: https://paste.ee/p/s0AcX

For some reason, now it's persistent with server restart. First restart reset it, second one did not.

Then it reset after I got hurt. I don't even know what to think anymore