The fire button is getting stuck.
Yeah, it looks like it's getting stuck because part o the contact pin is either bent or has broken off, the button isn't hitting directly to depress it, instead it's getting "stuck" on the edges of where the contact pin broke off.
Rebuild kit easy fix.
Your button cover looks kinda low. That could be reason you have been having to "mash" it. Take it off, Put a peice of
thread over the button (like a thin spacer) and then place the button cover back on once you rebuild your REO.
I can't say for sure with that photo, but you want to diagnose the "mashing" since you don't want to keep breaking pins either.
