I write a post on my phone, using brave browser, copy a link, select text in the post, click on the link button in the post toolbar, paste the link, and the post is 'sent' as well as the link being added to the post...
I'm trying to follow, I know there are some interesting key combinations that do unexpected things. However what I would do in this situation is copy the link from the post number and paste it as is. The forum converts it to a clickable link for you after you post it.