Clicking on Mounted at link in Disks opens Handbrake

[gordon]

I'm getting deja vu:

Strange behaviour program starter top panel

FYI, I've seen this bug before: I don't really remember the specifics too clearly, but something (I think it was VLC in my case) had decided to associate itself with folders. I fixed it by editing ~/.config/mimeapps.list and changing the inode/directory= entry to caja-folder-handler.desktop Removing the PPA has obviously fixed your scenario, but the method I mentioned should let you reinstall it if you want without it borking your shorcut, hopefully.

Read from the top of the thread onward to get the full context; that particular post to which I linked is just a relevant "solution", I suppose.