Please try this:
- Open a new SketchUp file
- Open 3D Bazaar and import “Skatter Tall Grass”
- Close the Skatter Composition Editior without generating
- Go to the SketchUp Components window, click on “skatter2_grass_tall_large” and place it in the model
- Start Enscape, does the issue appear?
Also, are you importing the grass from 3D Bazaar as “Proxy” or “High-poly”?