Hello there, @Melly Rockrr.

Thank you for the complete information and for the detailed screenshot about your concern. Allow me to help share additional information about printing a deposit slip in QuickBooks Online (QBO).

When printing the deposit slip and summary in QBO, the check number only prints in the deposit summary section and not in the deposit slip section. The deposit slip only reflects the amounts of deposit and the total. This is how QBO works as of the moment.

For more information about printing deposit slips in QBO, you can check this article: How to set up and print deposit slips.

Please don't hesitate to add a comment below if you have any other questions about printing deposits in QBO, it's my pleasure to help you. Have a good day ahead!