MC 1.12.2. Faithful32-1.12.2 (last update). All textures of glass have bugs. Without texture pack, everything is fine.

Without texture pack

Unfortunately I cannot reproduce the problem, all looks fine on my end.

Which glass is this that is disorted?

I am currently on Enigmatica 2 Expert which contains BetterFPS and FoamFix, but also without OpitFine (usually I add it to the packs but at the moment I have not).

Really weird, 2 times rebooted the game and everything was fine)