I appreciate you for updating us on this, laurynrecchia-gm. I know it can be difficult when you have duplicate amounts on your invoice. I'm here to help you get this fixed.

I replicated your concern and was able to convert my estimate to an invoice without duplicating the amount. Not to worry, I'm here to ensure this gets investigated.

Before proceeding, I'd like to know how your customer pays you? Are they directly paying from an estimate? If so, QuickBooks automatically marks the transaction as accepted, converts it to an invoice, and records the amount as a partial payment. For more details, please see this article: Request and Receive Online Deposits on your Estimates.

However, if you're manually converting the estimate to an invoice, I'd recommend performing the steps on your private browser. This helps us determine if this is a browser-related issue. You can follow the steps shared by Divina_N.

In case the issue persists, I'd suggest contacting our QuickBooks Support Team. They're equipped with tools to check the cause. It'll also allow them to submit a ticket to our engineering team to alert them about the issue if necessary.

Additionally, I've included an article that'll help you personalize your sales forms in QuickBooks Online. This way, you can add the info that matters most to your business: Customize Invoices, Estimates, and Sales Receipts.

I'd also suggest sharing a screenshot of the invoice or the steps you've performed when converting the estimate.

I'm only a post away if you need more help in managing your sales transactions in QuickBooks, laurynrecchia-gm. It's always my pleasure to help you out again.