When I exported from Iclone an FBX and loading it into Marmoset toolbag I have the bug you see in the image , in Iclone with the Delete hidden faces options active cause that issue when it is turned off everything is fine , I also noticed that when delete hidden faces is ticked on , the software exports the mesh triangulated , not that it is an issue but Is always cool to keep it quads for presentation purposes.
Thanks for your feedback!
Can you attach again your image?
If you telling us more about your exporting workflow(ex. What FBX format did you choose? For Unreal or others? ), that will be helping us to understand the situation.
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