I’ve got your file and I see the problem. You’re using the "Last saved SketchUp View and you’ve modified it. It’s not a good idea to use Last saved SketchUp View as the scene for viewports and modifiying the scene in LO creates problems because you disconnect the viewport from the SketchUp scene.
There are also issues with your SketchUp file. I purged unused stuff from it and got rid of this:
I’ll see if I can fix up your model and make it the way it should be. Hang tight.
It’ll take me a little longer than I thought because I’m fixing your SketchUp model first. You’re using layers incorrectly. This is also creating problems.