Seal from shower glass return keeps coming out

[jameslpool]

Hi, we had a new shower unit fitted about 5-6 months ago.
The seal (or what ever it's classed as) keeps coming out as you can see in the pics.
the one on the left doesn't do it, but the one on the right does.
I can pop it back in but after about a week, you see it just staring to come out again.
Not sure how to fix this or why it's doing it?
Can anyone advise please?

 

[Madrab]

Seal not fitted all the way in probably.

If those seals aren't fitted in fully tight and flush, it can keep pushing it's way out, given it's black and pic not in close enough so can't really see if that's the issue. These seals are very finicky and they may look in but they can be tricky at getting them in past the last ridge. Only issue now is there may be moisture in behind the seals so ideally the panel would be moved out, everything cleaned and dried off and then refitted properly.