I’ve had this bug ever since the introduction of focus mode, I just never cared enough to post about it because I thought it would get fixed by itself…well it didn’t. 
Here’s a gif showing the problem. Basically, if you type in a answer that Bunpro doesn’t want, the question disappears and will only come back if you move the mouse out of the webpage area (Windows taskbar, browser address bar etc bring the question back).
This is especially annoying because I type with both hands, which means I have to reposition my hands every time I get a close enough answer. 
From what I can tell this only happens on Firefox, which is my main browser though. I’ve had this happen for over a year now and in this time I’ve built a completely new PC with new Windows installation, new Firefox installation (clean install with no addons) and nothing has fixed this.
It also seems like I’m the only person that has this issue though, which is weird since I doubt I’m the only Firefox user here.
