I have a similar issue with Chrome (Android) when it zooms in on a reply making it difficult to go to the end of my post.
One solution seems to be to minimise the Reply window and maximise again, you don’t lose any content this way either. That seems to resolve it. It’s just slightly annoying rather than a real problem.
Have had the same issue for a while and fairly sure it’s been mentioned above, just got used to pinching the sides of the screen towards the middle to get it back to full screen again.
In all honesty I tend to switch off other recreation and footy when the Olympics is on, too much and my spirits are down lately anyway with the Dons sadly
IDK - weirdly enough it told me that it would reset in an hour - every time I liked a post after that during the hour it came up with the same message.