Just to clarify:
On mobile versions of the entire Blizzard forums, regardless of game, the pages of a subforum listing all the individual thread titles are stretched beyond the viewable space of the screen, so things like thread authors and a portion of the title itself is cut off on both sides. This remains the case regardless of screen alignment is in vertical or horizontal mode. Resizing does not work.
Can confirm on Safari in iOS 15.
P.S. I realize this isn’t really an Overwatch issue, so I’ve also tried to open a Support ticket to report this bug, but can’t even get past the forced category selection, since tickets are only accepted for the Battle.net app and individual games. It apparently never occurred to Blizzard that their long outdated last century relic of a forum system could ever go wrong. 