Thanks Romullus!
The walls have thickness, but i think there were spots were bevel may have create that strange/ weird look of leaking light that i could not solved.
I didnt see that oil stains all over the place and aparently the clients also dont.
Maybe some exagerated roughness here in there on wall, will check that next time.
But for the record, the last image from the oven it was not delivered, i just add it here. I assume they would not like it :)