My mannequins seem to be taking off the armor/clothes they've been fitted with.

The gear goes on ok, I can leave cell and return and it's still there, but after exploring the world and doing quests inevitably I'll return home to the mannequins standing there naked with the gear in their inventory but just not showing.

I have dawnguard and hearthfire, no clue if either of these are at fault. I'd uninstall the dlc's and test again but my save is well into both dlcs.

The mannequins I'm refering to are regular purchased vanilla house mannequins, not dlc house or anything in dawnguard, so I would figure any new dlc code shouldn't be effecting the legacy mannequins.

Any ideas?
Is this a known fault?

I appreciate any help or insight.

Thank you,