You think an item stays on the ground till someone picks it up?
No it gets deleted after x seconds, once it's deleted its deleted forever from the server.
Two options happened here:
1: You dropped it on the ground when you re-logged and it was gone due to server had deleted it.
2: During the time you were re-logging someone swooped in and saw the shield and picked it up and is currently using it.
I believe option two is what happened, unless you took like 1 minute in order to re-log.
Just like any other normal day in a guild pt of GayMates
The administrator has disabled public write access.