Thank you very much for trying to reproduce it. As you said, there are colored marks in this document, such as pink boxes. Click on the boxes or any colored marks would trigger a "box note" pop up. Or you can try to select the text in the pink box area, and you will find that these words may be difficult to select, so the mouse clicks on these colored marks by mistake, thus calling out a comment window.
Here, I uploaded the pdf file where this problem occurred to facilitate the reproduction of the problem. Wow your reply so fast as I just refresh the page! So this problem is a known issue🤔 Sad…
Support extract pdf Highlight notes with deeplink URLs
Unable to close the pop-up annotation window