Hello there, Stefano. I'm here to provide you with some troubleshooting steps to help rectify the issue of receiving emails twice in QuickBooks Online (QBO).

We can do some browser troubleshooting steps to isolate the issue. To start, open your account in a private browsing window. This step can help identify if the issue is related to a cache-related problem. You can activate private mode using the following shortcuts:

• Google Chrome: Ctrl + Shift + N
• Safari 11 or newer: ⌘ + Shift + N
• Mozilla Firefox: Shift + Ctrl + P
• Microsoft Edge: Ctrl + Shift + N

If this resolves the problem, you can clear your browser's cache to refresh it. If the issue persists, I'd recommend switching to another supported browsing application.

On the other hand, I suggest contacting our Customer Support team so this can be further checked in a secure environment.

Additionally, you can run and save a monthly expense report by the supplier to see how much you're paying each supplier on a monthly basis.

Let me know if you have any further questions about the purchase order. We're here to assist you 24/7.