Bug in key replacement

Hi everyone.
I do not know very much the program but I succeeded in creating a simple replacement for the "E" key which is dead on my macbook. the shortcut im using is f3 (function key) for plain "e" and the same plus capital key for the "E". All seem to work well except sometimes for no reason I can figure, when i type the f3 instead of the normal "e", i get a bubble containing all types of "e" possibilities like: é ê ë è ...etc and without the plain "e". Once that occurs it stays like that, even if I quit the program ... Is this a bug or is there a certain setting I have to apply in the application or on the computer to stop this thing happening...?
Thanks ;- )

Nobody has an idea... ?