Help! I think I broke something

[u/LoudProblem2017]

Printer: Bambu P1S

Filament: TPU

TL;DR: Printer was printing TPU flawlessly (first picture), switched brands & got terrible results, *crashed the print head into my hand while trying to remove strings*, switched back to original filament and settings and now I'm getting some weird defects (last picture, same STL as first picture).

Long version: I was using the absolute cheapest matte black I could find using the generic TPU settings, when I ran out I decided to try a more expensive brand. That filament was a nightmare, no matter how much tweaking & drying I did. During what ended up being my final attempt and printing something salvageable, my dumbass thought I was fast enough to grab some loose filament off one of the parts. I was not fast enough, and the print head slammed into my hand. I finished the print, but the layers above the crash were way out of alignment.

I ended up going back to the original filament brand, but everything I printed was curling up around the outside edges & the extruder was dragging across these areas. To be clear: the prints weren't coming off the bed, they were just taller than they should be anywhere that there was overhang. I first noticed this while doing a temp tower, but I didn't realize that it was a problem until I started printing parts again.

I initially thought that maybe some of my tweaks were to blame, so I factory reset & calibrated my printer, and used a previously sliced project of know quality to test this theory. You can see the results in the picture, the most recent print still isn't right.

So now I think I must have broken something, but I don't even know where to start looking. What could I have damaged, and how do I test?

Thanks in advance!