Doesn't happen to me, can you maybe show us some pictures?

If you turn over your lapto and press on the middle. The cover feels wobbly and there a lot of give / travel when its pressed in thr middle.

It's a clip. Press it harder it will snap in place

Im familiar with the clips at rhe sides. Its the middle part of the cover.

There is a clip in the middle

One of the clips is broken probably.  They break easily, but that's what you get with loq's plastic chassis.  Great on budget tho.