All working fine this side, just checked it, so yeh must have not selected custom

since its paypal there is a receipt message sedy in the community messaging system and link him an image of the receipt to get it corrected so you can get your correct amount

i did..i tick the circle and write 40...but nvm..i check my late mail came it reduce to 10 only..that y i need admin to check..whether something faulty there or not..and my creadit card provider says it i have use RM31(My Currency) with mean USD10..

same thing happen to me. reason is simple you didn't "check" the circle for custom amount.