Are you clicking the done on the inventory, or done on the merchant screen? I have that problem because i'm used to oldui..
__________________
++[>++++++<-]>[<++++++>-]<.>++++[>+++++<-]>[<
+++++>-]<+.+++++++..+++.>>+++++[<++++++>-]<+
+.<<+++++++++++++++.>.+++.------.--------.>+.
|