Changing PS4 Controller Ribbon - putting back doesn't work?

Hello all,

I'm changing the ribbon on a PS4 controller, when I put it back together the R/L 2 buttons don't work fully, you have to press them very hard to get them to work. However, if I take the two screws towards the top of the controller out and close the case, everything works fine, I can't get to the bottom of why this is. Is there too much pressure inside? Is the ribbon replacement not good quality? Any help would be appreciated!

Many thanks

Oliver

Any help anybody? Would be a real help.

Thanks!