Regarding Shield/Sand Glitch
I think the shield/sand glitch is from when you have something else in your pack, you switch to it (ie: a MedKit) to do a quick rescue (or place a sandbag) then quickly manually change back to your Shield while you're still selected on your 2ndary slot. Does that make sense?
Example: Theoretical... I have been watching this glitch lately, I think this is near the pattern as occurs.
- Equipped: Gun, Shield, Grenades [Medkit in Pack]
- So one is downed, you move in to rescue.
- Open inventory, click on Medkit for quick switch to 2ndary Slot.
- Heal Player [2ndary slot becomes active equipment slot]
- Quickly Switch back to shield after Medkit Consumption while still selected on 2ndary Slot
[**]So your shield should pop back up in the active position but it seems to place itself as a gun in your hands instead of Shield Default Position. This is when the quick switch is needed to reset it to the right position.
This is the pattern I have seen so far, but I'll try to actively check this pattern later.
I am not certain if the glitch is tied directly to the way in which the Shield is re-equipped such as: Drag and Drop vs. the Quick-Click.
But I do think it may have to do with still being on the active 2ndary slot when you re-equipped the Shield or a Second Sandbag after using a consumable from the 2ndary Slot. (Sometimes the second Sandbag also sits funny or doesn't show when you go to replace it immediately after placing the first one.)
I'll see if I can get a little footage of it happening. It may be hard, it seems to be somewhat random, at least for me I don't think it happens every time, but often.