[Bug Report] Wrong Number Shown When Unstacking

Dear Technical Team,

I do not know why, but when I wished to unstack
a pack of 21 Scroll of Wisdom - the number shown
was 19 and 1 (Should have been 20 and 1).

Here is a picture of the problem:
http://img818.imageshack.us/img818/5108/screenshot0004e.png

Best Regards,
Kfir Cohen. (Omga4000)