"Glitchen" is plural already.
ONE Glitch
TWO Glitchen
or, TWO Glitches
but "GLITCHENS" IS NOT A WORD!!!!!!!!!!!!
It's like "oxen" or "children" - you wouldn't write "greetings fellow oxens" or "greetings childrens"! Not unless you were TRYING to give us amateur grammarians conniption fits!
Deep sigh... I just had to get that out of my system...