Vray transparencies; plaster ceiling looks transparent

HI there, i need some help figuring out what is happening with my model, i am trying to render in vray this plaster ceiling, it is not any transparent material, but every time i render it appears like glass, i have checked multiple times and all my faces are closed, i am a bit confused and have no idea what it could be, any thoughts?

Are they correctly oriented?

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It’s hard to know from a simple image, if you share your file we could check what’s the problem.