hi
it's a glitch, but you can use a workaround for now
1. Launch the game in browser and select Change Equipment under My Equipment.
2. Go to your bag and un-equp the bag by un-checking the Equip checkbox.
3. Save Changes.
4. Go Back to Change Equipment.
5. Click on the Bags tab and drag the bag back over to the Drag Bag Here area.
6. Add equipment as needed and save changes.
-wgticon