I have recurring invoices to be sent out the 2nd Monday of each month. However, they were sent out on the 9th instead of the 11th this month. Why?

Good to see you here in the Community, @continouslm-gmai.

In QuickBooks Online (QBO), the due date depends on the term you've set up in your recurring transactions. Let me walk you through how to customize the recurring transactions.

1. Click the Gear icon, and choose Recurring Invoice. 
2. Press Edit under Action. 
3. Under Interval drop-down arrow and select the specific month you wanted to be due. 
4. In the Terms drop-down field, select Add new.  
5. Set the term Name, choose Due by certain day of the month radio button, and enter the day of the month field.  
6. Tap Save.
7. Hit Save Template. 

Here are some resources that you can check to help manage your recurring transactions in QuickBooks Online:

• Create recurring template
• How to handle a recurring transaction that did not run
• Recurring transaction doesn't send automatically

Keep me posted if you have any other concerns or additional questions. I'll always have your back.

This failed to answer my question.

Thanks for getting back to us, @continouslm-gmai. I'd like to make it up you by sharing additional information on why does your recurring invoice sent out early than expected.

Since you've set days advance for your recurring invoice, this is the reason why it sent out 3 days in advance before the intended scheduled. In this case, you'll need to remove that and leave blank to the Create days in advance box, if you don't want to sent out your recurring invoice early.

For more information about the process in creating recurring transactions, you can check this article: Create recurring transactions in QuickBooks Online.

Once, your customer already paid for the products or services, you can refer to this article: Record invoice payments in QuickBooks Online.

I'm always here to help if you have any other questions. Feel free to add a comment below. Have a good day!