It's not cura, its sketchup. It might display your item correctly, but it is infamous for its horrible meshes. Especially when trying to 3D print.
Try viewing the model with x-ray in Cura. If there are red areas, this means that the model is incorrect.
Go to "expert" settings and in the "fix horrible" section uncheck everything. That should fix it.
If not, right click on every gray face/side you see (in sketchup) and reverse them such that the white side is facing outward.Edited by Guest
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