Paths not recognized in browser - parts of model missing

[Zeesy]

Thanks for this great project! I've made a test illustration following the readme instructions, and saved the files as svg with a path system similar to the example svgs (using Adobe Illustrator). However, there are major glitches where hands and the head/face are not recognized (see below). Should the layers, groups or paths in the file be modified? It's hard to tell how it's different from the example.

When all of the elements are unique paths, the head is not visible but the path on the shirt is.
Set-up:

Result:

When the face is grouped, the head is visible but the face is not.
Setup:

Result:

Whole head grouped results in no head at all.
Setup:

Results:

Hands are missing in all three cases.