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Why my Firefly wallet cannot show full balance on TanglePay?
The Firefly address structure is a multi-address structure, which means there may be many sub addresses in one wallet. So when you import your Firefly wallet on TanglePay, sometimes the wallet shows 0 or partial asset. The balance appear on TanglePay is the real balance in the address, the same as the one you will see when you search it in https://thetangle.org/
We highly suggest you to create a separate wallet to use on TanglePay instead using your Firefly address on TanglePay since we are not aware of all the potential compatibility issues with a Firefly wallet to use on TanglePay.