Hi, I am using Blockchian.info wallet, I have 0.00242607 BTC
when I want to send bitcoin to an address with fee 0.00045426 BTC, it only allows me to send 0.00085799 BTC. I can't send more than 0.00045426 BTC while I have more than this amount in my account.

anybody know why this happens?

here is a screenshot :

http://up.vbiran.ir/uploads/32060151324964922523_Screen%20Shot%202017-12-14%20at%2023604%20PM.png