Before anything else - I like this mod and I using it to automate my factory in "pre-drones" phase. Thanks for developing it.

Mod version: 0.1.22
Game version: 0.16.51
Other mods: none
How to reproduce: Place cart on the ground (just cart or electric version). Fill their grid with any modules (any quantity), grab cart back to inventory using long right click.

Thanks for the report.

I noticed armor, and at least some vehicles, retain grid content. Time to figure out how...

This should be fixed in 0.1.23.