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We didn't receive a report about this issue. We'll want to make sure that you'll get the best help you need.
You'll have to ensure that .CSV file doesn't include symbols or characters to prevent any error. Let me provide the correct formatting for CSV files.
Here's an article for the complete information: Import bank transactions using Excel CSV files: How to Import Bank Transactions.
However, if you're referring to your transactions in online banking which are not syncing to QuickBooks Online, you can try running a manual update.
For future reference, please check this article when categorizing bank transactions: Match and Categorize Bank Transactions in QuickBooks Online.
Post a reply if you need further assistance. I'll be here to help.