I have an Android phone and use Chrome; haven't had an issue myself. What happens when you attempt to reply? Does it kick you down to the bottom of the page? That's a known issue - you have to scroll back up to where you were attempting to reply, and the text box will be there.
Kinda annoying, I won't lie, but it's on the to-do list to fix. Overhauling the forums and message system was always going to come with issues and annoyances; we just need to iron them out!
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