I've never used taptalk just the normal forum on my iPhoneMine doesn't do that, just tested on a few threads. Are we talking Tapatalk or the main forum?
I have been getting that bug forever, I think Tapatalk gets confused.
Again, I have personally never seen this, screenshot?
Also, I have just reinstalled Tapatalk and checked everything, so mind trying again @damienga15de ?