Hello CipiCips,
Ok first off make sure you spell words the same way every time Button <> Botton.

Second If you are using R/C servos is there not some setting to cause them to stop ( I am not an R/C guy ) if so perhaps between else and endif you could specify that setting.

I think I would group my code into sub routines and make a main loop which checks the buttons constantly, something like so:
mainloop:
while 1 = 1
if button1 then gosub right
if button2 then gosub left
wend
Do not forget to put return in both sub routines