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No, sadly that didn't work either.
I checked IW5 (which I downloaded yesterday), that one seems fine, the one class I made is still there.
I also checked T4 (which I downloaded LONG ago), that one seems fine as well.
It's only T6 that I'm having problems with, and I just yesterday tried to reinstall the base-game again on steam and reinstall qBittorent and plutonium and it didn't work.
I don't really know what else I can try to do.
Whenever I go on BO2 plutonium again after logging off, everything such as my progress, classes, and scorestreaks get set back to what they were when I first logged in a few days ago.
As of this moment, I've currently tried a few different things both in-game and outside of it: I reinstalled qBittorent and plutonium, I did different kinds of small things in-game to see if they'd work (mostly small methods I found on the internet, they didn't work).
I started having the problem around 2-3 days ago (it started when I came back to plutonium to play).
My own conclusion on this case: It's either something with my account data or something with my files.
https://prnt.sc/1vh1t1z (screenshot of my plutonium folder)
If you want anymore details, than I'd be more than happy to give them 
Thanks in advance.