When you hold down shift, items will go into your inventor or in your slot. But with this bug, it's happening but your not usin the shift button. You have to restart minecraft
To fix it.
MC-15251
Shift is being used without holding down shifts
Resolved
Duplicate
0
Stephen Dell
(Unassigned)
Unconfirmed
Minecraft 1.5.2
Retrieved
43rd Duplicate of MC-886, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.