Scenario
After successfully importing the CSV File created, users noticed in the Match Bank Data page (Transactions > Bank > Match Bank data) that Credit transactions type amount are negative and Debit transaction type amounts are positive.
The reason for this is that Credit Card account type are Liability accounts. As such, CREDIT transactions from your Credit Card bank statement are treated as additional liability which would eventually reduce your cash balance (negative).
Solution
Edit your CSV file and have CREDIT transaction type as negative and DEBIT transaction type as positive.