There are some exchanges that do not give Coinpanda access to the entire transaction history using API keys. If you have traded on these exchanges, you may have to import a CSV file to make sure the entire transaction history has been imported.
Here is a list of known exchange API limitations today:
Binance does not allow syncing transactions for delisted cryptocurrencies. If you have traded a coin or token that has been delisted, you will need to import these using a CSV file or by adding them manually. The following are known cryptocurrencies that have been delisted by Binance so far:
CLOAK, MOD, SALT, SUB, WINGS, BCN, CHAT, ICN, TRIG, CTR, LRC, BCHSV
All FTX leveraged tokens (BEAR, BULL, ETHBEAR, ETHBULL, etc)
Huobi provides trade history for the past 4 months only through both their web interface and API. If you have older trades, you will need to contact Huobi customer support to get your complete transaction history sent as a CSV file to your email address.
Bibox provides only trade history for the past 3 months through both their web interface and API. If you have older trades, you will need to contact Bibox customer support to get your complete transaction history sent as a CSV file to your email address.
It looks like Bitstamp might have suffered some data loss between February 2018 and March 2018, so trades around these times may not be imported. You will need to add the missing trades manually or via CSV file import.