Export Blender to 3d Stager

Hi , I’m exporting from Blender to stager but Something looks wrong here, any ideas?
First image of the blender image , next the 3d stager result.

Inverted normal on the top inner rectangle grid ??
(Overlays → Face Orientation … everything blue?)

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Could be , but my gess is that it’s something in Stager 3d import since I tested the same FBX somewere else and it was fine.