i’ve seen something like this before, where the kernel holds the file handle open for the process so that it thinks the file is still there. i think it’s related to how the program closes the file but i don’t remember the details. restarting qbittorent will most likely fix it.
sure, do that. and good luck with this, i did something similar for a project once and as usual its those last 5% that are going to cost you 90% of the time.