Yeah, the screws that were mentioned should have been used to hold the screen to the light frames if things were installed correctly there.
I have a feeling that the person installing the light kit may have removed the screws from the speaker plates, removed the speaker plates, put the light frames on, but not installed the screws into the sides of the light frames and into the screen. Then just kinda pinched the screen between the light frames and put on the speaker plates and they have been, barely....I'm expecting, keeping it in there.
I've never seen that before, but I did see someone keep the speaker plates and screen screwed together. They removed the 8 nuts holding the speaker plates on, removed the whole speaker plates and screen piece together, put down the light frames and then put the speaker plates and screen back down on them. So, the screen was just kind of floating 1/2" behind the clear shield behind the panel and being held in place by the speaker plates on each side.
There are other things that should also be corrected with that install, and I hope the OP reaches out.
Doug (SpeakerLightKits.com)
Strange floating screen GotG install (resized).jpg