some of them are different... here, at least...
many have sand mixed w/ the paint to add grip. many don't.
try not to be gunning it around corners or taking away from lights and that will help most. how are your tires? crosswalks are pretty dangerous in general concerning motorcycles. i'd compare them to wet fall leaves and oil on the road just after the rain starts.
looks like you're starting to learn that crosswalks are something to be respected though... that's your best defense.