so you have problems with hp, not with fplaunch?
what is your controller? what does it mean esc is mapped button? - you should not use any mapping software since hp, vp, fp and fplaunch can recognize joystick buttons directly
this what you are getting looks like "control-escape" combo to me - so if you get it just by pressing escape - it looks like your control key is stuck or windows think it is pressed - try to press all control keys once to see if windows will register that control is not pressed any more
for using esc in hyperpin and e in fplaunch - you should configure same key in both application, preferably e because esc makes problems - but you can use joy# buttons also directly in hp and fplaunch - check manual