I was messing around with the debug plus mod, to see what happens with large quantities of stencil jokers without increasing the cap. At 23 jokers I noticed the mult in my score would briefly go to zero before going back to one. So then I wanted to see if it was the quantity of them or the fact that the joker cap was still 5 so I made them negative, and the issue still persisted. It had no impact on the actual gameplay though.