all the transaction match on transactions appear back again like it never no one work on them please help

Welcome to the Community, Karni. I'd be glad to help you with your transaction that got unmatched in your bank feed.

In QuickBooks online, once you match transactions, they automatically disappear and go to the Categorized field.

However, QuickBooks may not work well if there's a problem with the web browser. Make sure to check your browser if you're having issues. We can help you by logging into your QBO account using a private browser.

To do this, follow these steps:

Google Chrome: Ctrl + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Microsoft Edge: Ctrl + Shift + P
Safari: Command + Shift + N

If you can successfully log in using a private browser, go back to your regular browser and clear its cache.

In addition, you can refer to this article for detailed steps on how to match your transactions: Match online bank transactions in QuickBooks Online

Also, you can check on this article to learn how to review downloaded bank and credit card transactions: Categorize online bank transactions in QuickBooks Online

If you have more concerns with your bank transactions, don't hesitate to post them here in the Community. I'm always here to help.