It could be the case that transactions are in the correct period but do not have the correct date on them. Check the date on the transaction to make sure it is correct and if needed correct from the pop over menu.
If further assistance is required Support will need to run some scripts on the database. Therefore please raise a new case online and reference the title of this article and please include details of the difference seen and the transactions affected.
Trial Balance difference between report and transactions
Updated over a month ago