I wonder if this is just a bug where it is not correctly parsing your addresses from your account.
Never used that wallet but if you have a seed or can get hold of your XPUB you can use it to generate the addresses somewhere else and check them manually (just be careful not to use your seed on something dodgy as to would be able to generate the private keys for your wallet; XPUB is not so bad as it will only generate the public addresses associated with that HD wallet - there is a privacy concern there but a dodgy service cannot steal your BTC)

You could also try to track the TX's from your exchange wallets but it will be hard to recognise which transactions make up the $10,000 you are missing unless you only had a few bigger transactions

Good luck man really hope you get it sorted out.