Can anyone tell me why i have 3 months bank transactions missing?

Hi info-drumsmittal,

If you've recently linked your bank account to QuickBooks, the software will only download transactions from the past 90 days. Anything older than that will need to be manually downloaded from your bank's website into a web connect file. Afterward, you can upload the file to the Banking page in QuickBooks. Here's an article with the detailed steps for your reference: Manually upload transactions into QuickBooks Online.

You can also check about reconciling your account for your reference in the future.

Feel free to go back to this thread if you have any other questions about bank transactions. Cheers!