Strange Sprite Atlas mapping all into one sprite

I set up some sprite atlases to combine multiple parts of multi-sprite character animated using Anima2D. For the most part it's working great, except that some sprites end up with the entire atlas mapped onto it. I do not understand why. There is no difference in configuration of the particular sprite meshes.

Ignore the clothing in this screen shot as they are no atlased, but the skin, eyes, eyebrows, mouth are:



As you can see, in the back view, it's working for all but one hand. In the front view, it's only working with one hand, one arm, and the eyes/eyebrows.

HELP!

Unity 2018.4.1f1
Anima2D v1.1.8

 

Oh I forgot to mention that it only does this in builds, not in Unity Editor (which makes sense since the atlases are only made at build time)

 

Further testing, Windows Builds built locally do not exhibit this bug, but only builds built in Unity Cloud Build service. Same Unity version is set (2018.4.1f1) and yet this difference occurs.