After the vampire fight in the Bone Keep there is an armor stand that can be looted. The loot on the stand is +1 half plate and +1 shield. They cannot be looted together. Looting them together with the same character will cause either the plate or shield to disappear. If you want both pieces of gear, you have to loot the stand twice. Loot it once for the plate with one character. Loot it again for the shield with a second character. I tried it a few times and the bug repeated an that was the only work around.