Oh, I forgot to moment that the disk cleanup showed that there were very little spaced taken up by temp files. Maybe like 100 MB while the TEMP folder itself was 124 GB, so that made me think something was wrong. Thanks for the explanation!
Here's a screenshot of it:
View: https://imgur.com/a/idnDYjA
I haven't cleaned it out since I built my PC back in 2017, so would it be normal to have the temp folder this full?
Is it safe to just delete all?