This bug has never been solved for me.
User Gudkov has the same issue and was able to shed more light on the problem in the linked post.
We provided images and videos to showcase the issue.
I tried everything listed previously to no avail, including a full clean install, no passport login, no addons.
I kinda gave up at this point
I will have to either use Maxthon with this broken feature, or stop using it and switch to something else, which would be a shame as I've been