is this happening when you start a challenge or when you start a normal run? Is this also happening like when you do your first run or is it after you have played for a couple runs?
It happens on both challenges and normal runs. I tried.
Also yes it is after a couple runs so I think that's why. Like, I have Atomizer in my last run and the next run I will randomly have small bullets, but then occasionally it will be random and give me HUGE Boy bullets even though I didn't have that upgrade.