BUG / ERROR: scrolling in long chats is messed up

it seems scrolling (in long chats, with 0 extensions) is messed up on iphone.

i have it saved as a safari homepage app bookmark. when u scroll up, it gets all jittery and many times there will be areas where it will mess up and glitch infinitely (scroll between two spots really fast so it looks like its just glitching out)

would this be possible to fix? pretty unusable.