When swap items in your hand it only show up the first item you'd in your inventory. This has been tested to occur both in creative mode and survival mode. No picture to show cause it's not easy to capture a good one to show the bug/glitch.
MC-15249
Item showup for other people
Resolved
Duplicate
0
Marcus Montin
(Unassigned)
Unconfirmed
item, server
Minecraft 1.5.1, Minecraft 1.5.2, Snapshot 13w18b, Snapshot 13w18c
Retrieved
Duplicate of MC-14220, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.