How to fix my backspace key?

My backspace key is wonky! It’s moving up and down (left and right motion sorta) when I type. I was trying to clean it because for some reason my when I tried to delete just one letter in between a word it’d delete the whole word or two letters instead of the individual one I wanted so I began to take it off, my laptop is an Acer and I had/have no idea if the keys are able to come up so I need serious help!!!

How do I fix my backspace key so it’s not moving and stays still when I type.