I just did a run that ended with me killing the dragon but I died before I could get through the portal. Does that still count or is the credit screen the end of the run?

I have just had a run rejected because I have used above gamma 5. Although, when I went to check my gamma, it was at 1.0???. I’m so confused as to why my run was rejected. I always set my brightness to 100% but that’s it that iv done on purpose. I don’t want my first sub 20 to be rejected

wth is gamma 5 and how do I get rid of it?