Comment multiple times the same file in Merge diff

For some reason, I have this situation:
Merge request has been created, I’m doing a code review so I went to “Changes” to review the files. I’ve been looking at one file and wrote a comment which opened up a discussion under line 1. In the same file, I saw something I wanted to comment as well in line 3, but whenever I click comment it’s like the javascript doesn’t even do anything and my comment doesn’t get posted. It disappears after clicking “Comment”.

I obviously want to be able to start multiple discussions for different lines of code where I want to raise a possible issue. Please advise on the matter if I’m missing something.

Is it that hard to provide answer for this? Your competitors do have this working, like Bitbucket.