UI glitching in BR tester

I'm currently reviewing a PT, but the UI is glitching out and making it slightly difficult. Whenever I open the tester, it seems fine, but as soon as I try to use the highlighter feature, the page seems to begin loading, in that I can see the blue bar at the top of the screen that seems to indicate that something is loading. While this happens, clicking on any question at the bottom, the next/back buttons, or using the highlighter don't work. The only way to stop it is to reload the page, which brings me to question 4 of the section I'm on. Whenever I try to return to question 3 (the question I am currently actually reviewing,) the loading begins then as well regardless of if anything else is clicked or not. I've never had this problem before, and my computer works fine and is very fast. What could be causing this? I've already tried clearing the cache, restarting my computer, turning off extensions, etc

edit: the issue seems to be specifically occurring whenever I try to go to PT 150 S3 Q3 ... I am able to click through all the other questions with no issue