Hello there, @Melly Rockrr.

Thanks for joining this conversation. Allow me to jump in for a moment and help make sure this is taken care of.

Just to confirm, are you having some issue printing check numbers on deposit slips? If so, may I know what specific issue you're getting? Any additional information will be much appreciated.

In the meantime, let's perform some troubleshooting steps that can help us isolate this. To start off, try logging into your QBO account using a different or a private browser. There are times that the browser is full of frequently accessed page resources, thus causing some errors and/or unusual responses.

To use a private browser, here's how:

• On your keyboard, press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox or Internet Explorer).
• Control + Option + P (Safari).

Once logged in, try printing the deposit slips again to double-check. For your reference, you can also check out this article for further guidance: 
How to set up and print deposit slips.

If it works, return to your default browser and perform clear cache to remove temporary internet files on your computer. Before doing so, make sure to take note of your saved passwords and URLs.

That's it! Give this a try and let me know how it goes by leaving a comment below. Please know that I'm only a post away if you have any follow-up questions. Wishing you and your business continued success.