It's because you "stai" there =P Thanks for picking that typo.
Regarding the jumping, I assume that Windows might be messing with the shift detection? If you type stuff while holding shift after quitting the game, does it make the letters uppercase?
Thanks for reporting. I will release a newer version (fixing bugs, supporting VGA and adding experimental OPL2LPT support) in the next few days. This version is still the original one, written from scratch during a mad sprint, over 2 weeks.