Accointing is stating for Kraken, that the exchange is reporting a certain balance (e.g. 1.23 ETH), but that the data imported into Accointing has a different balance (e.g. 1.3 ETH).
However, when I check the full data set, filter by Kraken and ETH, and manually add up the amounts, it does indeed add up to the exchange-reported value (e.g. 1.23 ETH).
So generally the error is that Accointing is saying that data imported adds up to the wrong value, but actually it doesn’t (or certainly doesn’t seem to!) - in reality the imported data and exchange-reported balance are equal.