Welcome to the family of QuickBooks, @TyC. Detailing your concern enables me to provide a precise explanation and solution. I appreciate you for doing that. 

I'll discuss this situation further as to why the bill payment is showing negative after saving it and how to fix it. This way, you're able to monitor them accordingly.

First, bills and expenses usually don't match up because they both serve the same purpose in QuickBooks Online. Use bills if you pay them later, then use expenses if you pay in real-time. For more details, see this article: Learn the difference between bills, checks, and expenses in QuickBooks Online. 

Also, you don't need to create a bill since you already upload the receipts. I'd suggest deleting the bill payment and bill so that the transactions don't double. This will also correct the negative amount.

Go as follow: 

1. Go to the Expenses tab.
2. Click the Filter drop-down and pick the following: 

• Type: Choose All transactions or Bill or Bill Payments one at a time. 
• Status: Press Paid. 
• Date: Select the appropriate date. 
• Payee: Elect the vendor name.

        3. Hit Apply. 

        4. Double-click the transaction, then press More and Delete. 

Additionally, if there's no record found after uploading your receipt, you can make a new expense transaction from your receipt. Let me show you on how:

1. Choose Review to make corrections or add missing info, then click Save and next.
2. Click Create expense.
3. Follow the on-screen instructions. 

However, if one record is found, please select Match to connect your receipt to the transaction immediately. For more details, check out this article: Upload your receipts to QuickBooks Online. 

Lastly, check out the following articles below to learn the different ways to record payments toward bills and other related matters: 

• Email receipts and bills to QuickBooks Online
• Enter and manage bills and bill payments in QuickBooks Online.

Feel free to post a reply and tag me in the comments below if you have other questions about your vendor transactions. I'll take care of them for you. I hope everything is clear, @TyC.