Hi there, @IVANABRESKIC ...
I have a slightly different take on this. Somewhere in the back of my mind, I seem to recall seeing something similar in an instructor's course within our own Canvas environment. Upon investigation, I discovered there was some rogue HTML code in the discussion prompt text that was causing the text to overlap on other text on the page. It was pretty strange. So, maybe you also have something going on similar to what I had experienced? One way to maybe fix this is to use a HTML cleaner site to clean up a lot of junk HTML code. A long while back, I wrote a blog post here in the Community about this called HTML Cleanup. You could certainly try this out and just paste the code in a separate, unpublished, discussion topic. (That way, students aren't seeing it as you are troubleshooting.) Then, you could always move that code back to the discussion topic that is showing the odd overlapping once you know things look okay on your end.
Hope this helps a bit. Sing out if you have questions...thanks!
