Something kind of wonky is going on with the Elementalist's Changelin skill. When I leveled up again after learning it (so, Elementalist level 16), a second copy of Changelin appeared on the skill list, and while I was experimenting with all the possible weapon variants of Changelin, the second one only changed sometimes. It seems like there's some kind of hierarchy going on where a weapon type will only overwrite the second instance of Changelin if it has higher priority than the type it currently holds.
Like, when switching from Sword to Knife, the second changed and I had two instances of Knife Changelin, then switching back to Sword the second stayed on Knife, so I had both Sword and Knife Changelin available. An incomplete list of the hierarchy would be Sword<Knife<Spear<Staff<Claw<Whip<Heavy Bow<Gun<Heavy Gun. Once it got stuck on Heavy Gun that was the end of it, it wouldn't change anymore.
So not sure how much, if any, of this is intentional; having more than one variant of Changelin available at a time *would* be cool, but has a "too good to be true" feeling to it, and the nature of working out the hierarchy of "stickiness" leads to my thinking something is off. I made a separate save when I first noticed the second copy in the skill list (though after it was already on Knife) and have a link to download it, if that helps: https://www.mediafire.com/file/enleuba9ljjhv9k/20.rsav/file
EDIT: Oh, actually there is also one other odd thing about skills, I only just noticed, it looks like Heats, Morpa, and Alheats never actually upgraded to Heates, Morpae, and Alheates for my Barrier Mage. If it was only Heats I would've thought it had something to do with learning it as a Hexer, but she originally got Morpa and Alheats from the Barrier Mage skill list. Not high enough level yet for Almorpa to upgrade, so not sure if that will also fail to happen. I definitely think I got the level up notifications telling me that they upgraded, but they aren't on the skill list. Hm, Alheats is in the final, 24th skill slot, does "not learn new skills" also mean "not upgrade skills anymore"?
EDIT2: Completely unrelated bugs now. I checked the auction and found a key item called "Suit", no description offered when examined, and after buying it it does not appear in my inventory or my key items list. Ah, speaking of things not appearing in lists the Onyx I found that says it prevents death effects, while it is in my items list, does not appear as a valid accessory in the equipment menu.