Possible issue with STL Viewer

[MaxKessler5]

The 3D option on https://www.zaccord.com/item/product=120 as well as other products, appears to be broken:

I found this project while looking for examples of how to use viewstl (https://github.com/omrips/viewstl) and it seems like you're running into the same problem as I am, where the stl appears as a long triangular strip. I'm not yet sure if this is a problem with viewstl, or if there's some gotcha to using it.