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I am 15.2 and am on auto-update, but I will force an update and see if there is an improvement. As apparently it is just me, I will also flush my HT caches.Safari is the new IE, man.
Your diagnosis about the sprite offset seems correct, but alas, I could not reproduce in Safari 15.3. (Pretty sure that's the latest.)
It seems unlikely, but sometimes browser extensions/plugins affect pages in weird ways. If you have any installed, perhaps try turning them off?
Maybe try here: https://xenforo.com/community/forums/bugs/