I removed a couple of edges and now my model looks "hollow"

[VampiroMedicado]

Hi, I was working on a person model for a boardgame that is intended to be used in Tabletop Simulator as a piece model.

I got the general idea and was trying to make it's "hands" look round and removed a couple of edges, which did make it look much better in Wings3D, but when I exported it as an .obj file it didn't work as intended.

I tried googling the problem, and using AI to find a fix but I'm not even sure how exactly could I describe my issue.

Any ideas?

In Wings3D:



In game:



My wings file: https://pixeldrain.com/u/3SH4WNjv