Let's go through some troubleshooting steps to fix the quantities that revert to 1 when invoices are saved in QuickBooks Online.
I need more information about this before we begin. Is the problem happens when you edit or create a new invoice? Any information can assist me in determining the best solution to this issue.
When I tried to create a new invoice and then edit their quantities, it worked perfectly. You may have encountered a cache problem as a result of outdated data stored on your browser. Let's start fixing it by accessing your account through a private or incognito window. This mode can help with some browser issues since it doesn't save any site data. The following are the shortcut keys below:
Google Chrome: Ctrl + Shift + N
Firefox: Ctrl + Shift + P
Safari: Command + Shift + N
If everything appears to be in order, you can return to your regular browser and clear the cache to remove previously saved browsing data. You can also try other supported browsers to narrow down the cause of this behavior.
If your invoice is converted from an estimate, you can edit the quantity on the estimate first or turn off the progress invoicing feature before doing some changes.
Please let me know if there is anything else I can do in QuickBooks. I'll assist you in running reports, entering data, and more. I hope to see you again soon.