bitcoin unspent output: I have 54 btc available in my wallet but when i am trying to send it is showing 37

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Did you just transfer the missing BTC to your wallet? If so try logging out and give it 30 seconds and log back in.
3 bitcoins missing? Not sure if that is some sort of unreasonable fees you are being charged for transferring your btc outside your blockchain wallet. You need to contact their support I'm sure they will be able to help you out and shed more light on what's going on in your case.
Oh sorry it's 17 btc! Then definitely not a charge lol! Seems to me like some sort of technical glitch. I recommend you contact support ASAP and get to the bottom of this. Let me know if they were able to sort out this issue for you. Cheers