How is it possible : 15 @ 0.0013 StackItUp as the bid increment is by 0.0002 ...

I'm offering :
20 @ 0.0014 each (so 0.028 BTC + shipping)
I'm pretty sure the bid he was replacing was
Lot 2: 10 @ 0.001
and he chose an increment larger than the minimum. Your bid, however, was invalid as there were only 5 @ 0.0012...