coinb.in wallet balance does not match "confirmed balance"? Coinb.in wallet amount is different from "confirmed balance"? Is this because an earlier incoming transaction hasn't actually completed?
Coinb.in uses blockr.io for fetching UTXOs. Blockr.io is currently 153 blocks behind the bitcoin network (not sure why). 

Current Blockheight: 476961,
Blockr Blockheight: 476808


This is likely why you are having issues.