Models look glitchy when importing from sketchup?


I am complete a beginner at this. I made a 3d model from a floor plan in Sketchup Free. It uses a lot of components I got from their library. When I import them into twinmotion, the majority of them come out looking incredibly buggy. It seems as if the scaling is insanely disproportionate in a lot of areas, and a lot of the faces are missing.

When importing, selecting “two-sided geometry” seemed to fix some of them, but the model still just looks insanely buggy. Am I doing something wrong with importing, or in sketchup do I need to make everything one group or component or something similar?