Ok this is not a base factorio issue and maybe it's something the modder can fix but I'm throwing it out here anyway.
When an armor is part of a recipe such as dytech's power armor MK III, and you have a filled up MK II armor in your inventory, it will use that but all stuff equipped in the armor will vanish.
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[0.12.7] armors used in recipes don't get emptied
Re: [0.12.7] armors used in recipes don't get emptied
That's working as intended. See: https://forums.factorio.com/forum/vie ... 41&t=15311
If you want to get ahold of me I'm almost always on Discord.