On one of my maps, I have a event that's a gold colored frog that hops around the map at a fast pace, and if you catch up to him, he gives you something. I set it that so every time the hero enters the map, there is a 1/10 chance he'll appear, yet every time time I playtest(I know it's working), his sprite keeps changing between his frog sprite, and a blank one, making it look a glitch.