It's great to have you in the Community forum, bscoldstorage1. I'm here to ensure you get the help you need from the appropriate support.
Since the default payment terms vary between the web browser and mobile app when creating an invoice, I recommend contacting our Live Support team. They can dig deeper into this case to determine why they don't match and provide the most relevant fix.
Here's how to reach them through a web browser:
- Sign in to your QuickBooks Online (QBO) company.
- Select (?) Help, then proceed to the Search tab.
- Enter a question or topic from the designated field, or open an article.
- Click Contact Us at the bottom of the Help panel.
- Pick the Ask about something else option and add details of your concern to Continue.
- Choose Chat with us or Have us call you.

Also, please make sure to follow their support hours for convenience when connecting with the right expert.
Alternatively, you have the option to manually adjust the payment terms right within the transaction. To do this, tap the due date in the invoice and choose your desired payment terms.
Once customers settle their balances, document these amounts in the software to keep your account balanced.
You are always welcome to revisit this thread if you have additional concerns about invoice payment terms in QuickBooks Online. Add your queries by simply clicking on the Reply button below. We're always eager to assist you.