I add a "deposit" entry but QB adds extra entry for the same amount but as a "payment", I delete additional (wrong) entry but QB delete correct as well. What to do?

I'll provides some troubleshooting steps to investigate if this is a browser-related issue and help you remove the extra line when creating a deposit, michael238.

First, make sure to add Intuit as a trusted site. Then, make sure to use the latest versions of QuickBooks Online-supported browsers when accessing your account.

Here's a list of recommended browsers:

• Google Chrome: version 78 or newer
• Mozilla Firefox: version 76 or newer. 
• Microsoft Edge: version 79 or newer
• Safari: version 12 or newer (Mac only)

Using these up-to-date, supported browsers can often resolve unexpected behavior in QuickBooks Online.

Aside from that, you can also switch to an incognito browsing session and find other troubleshooting steps in this article: Troubleshooting browser problems.

After that, create a bank deposit to check if the system is no longer adding an extra line.

Feel free to check out or bookmark these articles just in case you need additional guidance when recording deposits in QBO:

• Link a bank deposit to an invoice in QuickBooks Online
• Edit the customer name on a bank deposit in QuickBooks Online

Don't hesitate to come back here if you have other concerns when managing deposits and other customer-related transactions. We're here to provide prompt and thorough assistance to address your concerns.