Invisible hd useage - what gives?

[Tyrannocaster]

I already did the tweaks, but it didn't save much space. In this case, the invisible files are as big as my entire installation of Linux Lite plus all the other stuff I've added, plus all my user files. I don't think it's hurting anything, but I also don't think it should be happening; if it got worse, I wouldn't know how to figure out what to do since I've tried everything I can think of. There just don't seem to be any actual invisible files anywhere that are very big, but something is taking up about 10 gigs of hard drive space that I can't account for.

The temporary files and package caches are part of the 10.7 gigs that QDirStat shows as legitimate useage.