Hi graham-cerminara,
Welcome to Community! QuickBooks Online provides features that enable you to complete your goals effortlessly. One of the many valued features is the option to set up bank rules, so your transactions will be automatically categorized, to save time when preparing to reconcile your accounts. Each bank rule allows you to select the option to 'Automatically confirm transactions this rule applies to'. Having additional transactions automatically categorized incorrectly, can have a negative impact on your books. I would be happy to help!
QuickBooks Online provides additional options for your bank feed. You can set your preferences accordingly. In your situation I recommend disabling 'Enable suggested categorization'. Here's how;
1. Open Transactions, then Bank transactions from the left menu
2. Select the blue tile for the account
3. Click on the small ⚙ above the Action column
4. Remove the checkmark beside Enable suggested categorization
That should do it!
If you experience the same result, please don't hesitate to contact us outside of Community. We'd love the opportunity to work with you in real-time, and ensure you're able to accomplish your banking goals as soon as possible!
Feel free to reach out again, if you have other questions. We would be glad to assist!