Sometimes when I create an invoice it reverts to ‘deposited’ when it hasn’t been sent. If I delete the invoice and restart it the same thing happens. Any advice please?

I can definitely help you with that, @userinfo142.

There's a possibility that the Automatically apply credit feature is turned on. It adds credits to the next invoice you send to the same customer. We can change this in the company settings to prevent this from happening.

I'll be delighted to guide you how:

1. Go to the Gear Icon.
2. Under Your company, select Account and Settings.
3. Click Advanced.
4. From the Automation tab turn off "Automatically apply credits".
5. Hit Save.

Take a look at my screen shot below:

You can learn more about this feature by giving this article a visit: Create and apply credit memos or delayed credits in QuickBooks Online.

Also, I've added this article if you need help on how to handle a customer credit or overpayment in QuickBooks Online.

As always, click the Reply button if you have any other questions. I'm happy to help. Wishing you continued success!