Newish (3years) bathroom tiles

[HenryGregory]

Hi, can anyone point me in the right direction as to what I need to do to sort this corner out?
It is a 3 year old new build. The plastic strips which go along the edges of these tiles in the boxing at the back of the bath seem to be cracking and coming out of line. Have checked and there is no water underneath, wooden frame under all seems good, wasn't the best tiling job to begin with, but just want to try and stick this all back before it gets worse.

Thanks in advance.

 

[Swwils]

Looks like it's been like that since install.

 

[HenryGregory]

Looks like it's been like that since install.

Thanks for posting, you are right, I managed to find a pic from the day I got my keys and that plastic trim was like that. But the top tile was flush with the plastic trim. It has very slightly started to stick up. I have tried to point it out in the below pictures.
Also, I am getting some cracks between the tiles by the shower controls. Any ideas on how I can try and prevent this getting any worse?

 

[Swwils]

Hard to say without know what the substrate is underneath or the bonding method for the tiles.

It's possible the grout had too much water in or there wasn't enough thinset, but even properly installed tiles can get cracked grout eventually.

You can rake out a small area and replace, doing a careful colour match. But this may be tricky if a non standard colour or mixture has been used.