Can't paste on mobile

Here's a short video of me trying to paste into comment field in a blog post https://photos.app.goo.gl/JWbEvn2JePmti98r7

Btw, i have to deal with this jumping all the time and it makes harder to start typing as view jumps out of bounds and i can't see what i type, so i have to carefully drag it back into view and it often jumps again and i have to repeat. This is not happening in quick reply form. Also for some reason in forums it is not loading editor for me on Pixel/Android 9 as it does in blog posts, so it works as with quick reply. But on Huawei/Android 5 it loads the editor so i have the same jumping experience in forums.