I currently am running SMB1 any%, with my previous PB at 6:43 (i know that's bad), before I recorded only the emulator but now I started recording also the splits, today I got a great improv on my PB of about 30 secs (getting a 6:15/16) but I discovered, after it was all done, that OBS screwed up the size of the game window in the recording, making it bigger and only recording the central/up part, and not the bottom, making it impossible to see the floor and other parts of the gameplay, while the splits are completly visible, should I still try to upload the run or do I try to do it again making sure I adjust the settings correctly?

Still let it be a lesson for you, no matter what the mods say. Always check obs before recording/streaming.

Also dont scale your desktop items, it really messes up with screen sizes and obs.

I didn't check cause it never happened, also the bizhawk window always stays the same size if the game is open, i never touch that, idk what happens, ofc it's a lesson but not a needed one :D

Yeah, it's a tough lesson to learn. It happened to me after a ~50 minute run of Operation Neptune and I had to re-do it because you couldn't see parts of the game. It could be worse, though. At least it wasn't the "make sure OBS is ¤actually¤ recording before doing the run" lesson. That one really sucks.