What happens when you mix catalase found in yeast with a small, medium, and large amount of isopropyl alcohol and hydrogen peroxide?

I conducted an experiment trying to see what isopropyl alcohol does to the catalase found in yeast’s catalytic activity. I can not make sense of the results which showed that a 1:10 ratio and 1:1 ratio of isopropyl alcohol amount to catalase had little to no effect on catalase’s activity but a 1:2 ratio significantly decreased its activity. Could someone please explain this?