Coinpanda considers 8 decimals for all your transactions which is in most cases the maximum number of decimals used in cryptocurrency trading due to bitcoin’s divisibility (1 satoshi = 0.00000001 BTC).
However, some exchanges round off these numbers and may only include 5 or 6 decimals in your exported trade history. This can in some cases lead to errors in your balance so that it looks like you are selling more of a cryptocurrency than you own.
The Transactions page lets you see a full list of all warning trades. If the missing coin amount is very small, it is very likely that the warning is caused by a rounding error.