Kitchen granite - edges opening up

Hello everybody,

I need some help please, see attached pictures ( 1 and 2 ) . 2 Years kitchen granite fitted by a professional is opening up and i am not certain why.

I need some advise please in rectifying this issue . Having had a close look if seems like it needs a small remedy, probably some sort of (clear joint filler )to stick it back against the wall.

Any advise would be much appreciated.


Thank you all .