I often use my companion as a secondary bank while I'm questing so I can carry extra loot. I instruct them to "Take All from Chest" or "Take [item]" or I just trade with them.

Once I return to some place where I can sell the gear, I go to take the items back from the companion through the trade menu, and the vast majority of them all have a stolen flag. I haven't done any thieves guild quests so as of yet I have nobody to sell these items to, and I have A LOT of them now.

I was wondering what caused this, will it be fixed and if anyone else has the same issue? It's maddening.