I don't know anything about simscale, but the first thing that comes to mind is, how did you export the files out of Solidworks and into simscale? Does it use native CAD data, or did you need to create a STP, IGS or STL or Parasolid file?
If the answer is yes, you had to create a STP file, then I would check your export settings in Solidworks:
Like I said, I don't know anything about simscale, but though I might help. *grin*