QB Issue Resolution:

Hm, that definitely does sound strange. Currently, we have not received reports of other merchants experiencing double capturing of credit card payments. What you’ll want to do is contact our QuickBooks Payments customer support. They’ll be able to investigate this situation and determine what caused this to occur.

Here’s how to reach them:

Log onto the Merchant Service Center.
Click Help in the upper right hand corner.
Click Contact Us on the left hand side.
Select your product and a topic your question is about – Other
Select Topic – Change my service
Get help: Select Phone Support. You can choose to Let us call you or Call us. Our phone number and hours of operations are listed under Call us.

Resolution for Issue 'Double capture bug on Quickbooks Payments (Intuit Merchant Services).' available: Yes (Solved).
Source: Intuit Community forum.

Double capture bug on Quickbooks Payments (Intuit Merchant Services).: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Credit Card
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