Finally decided to improve my account to VIP status (Already donated 11.55)
(Later I realized that I had donate $2.45)So I donate $1.45 via bitcoin, but when i done this it says i donated 1.44, so where is 5% discount?you should write 4% discount.
So i go too donation part and cancel my payment to prevent shortage $0.01 (lol)
But I did not get my money back :(
So here's the question: did I cancel the payment or/and if not, what do I do with a shortage of $ 0.01?

Rounding to two decimal places, as per current standards, is most likely the cause for your $0.01 'shortage', although, I can't provide proof of that as I can't work out the 4% discount you speak of. $1.45 * .96 = $1.39, or, $1.45 * 1.04 i= $1.5(0/1)

Thats a round up bug, should be fixed now.