when you have items in your inventory that are Anchored using random things spectre anchors, soulbound using enderio or using a backpack from wearable backpacks, upon entering a new shell for the first time these items get duplicated, but switching between shell storages do propperly swap this gear on/off.

so shell storage > shell constructor causes all soulbound items (and the backpack for some reason) to duplicate on the player

shell storage > shell storage works as intended without duplication errors..

fixed indev, should be in the next version

damn you're fast, thank you!

fixed by 6.0.1