There can be many reasons why your capital gains look too high or could be wrong.
Some of the most likely reasons include:
Not all transactions have been imported
Errors in the data imported from exchanges or blockchains to Coinpanda
Negative balances, which result in a zero cost assumed for the currency sold
Missing market rates
Currencies not identified correctly
Internal transfers between your own wallets are not identified as such
See our help article How to ensure accuracy of tax calculations for more information about the most important steps to take to ensure your tax reports are as accurate as possible.