UV unwrapping for procreate not always working?

Hello! I’m a 3d newbie, wanting to paint 3D in procreate. The UV unwrapping in Nomad seems to work mostly great but for some objects it seems to be missing spots when I try to paint in procreate. I’m pretty sure I did more-or-less the same process for each objects… any ideas where I’ve gone wrong? Thank you!

I believe it’s because I was checking normals on the obj export menu. If I let procreate make it’s own normals it works much better!