One of the main reasons for incorrect balances are missing or incorrectly imported transactions.
The table below searches for matching transfers (deposits and withdrawals) and shows the likelihood of the match.

Should any unmatched deposits or withdrawals remain at the end, please check your transactions and import any missing data until all transfers are matched.
If some of your deposits or withdrawals were actually income, earnings from mining, donations, lost coins, etc., go to the Enter Coins page and change the transaction-type accordingly.
In short: If there are no more white rows at the end, all transfers are usually correctly assigned!

If a match was found, the 'Match' column will show the conformity (100% if both amounts are equal) and the probability of a correct match (you may want to double check this, if the match is estimated as medium or low).
The recommended settings are: 95%-97% amount accuracy and the moderate time accuracy. However you can adjust the settings as required.