hi im no expert with this but i think its normal. my snakehead does that a lot they do it more when i startle them and i think maybe it has somwthing to do with the tank size cause maybe they wanna jump out and explore. they also rub them selfs on the gravel a lot and i had one that did kinda of a somersault in water once,well half a somersault.
if im wrong sorry im no expert but that what i think cause i read it once on the forum somewhere.
Do they eventually stop being jumpy or is this something they naturally do in the while? I thought only dolphins do tricks and back flip jumping. I didn't know snakeheads were that talented.