QB Issue Resolution:

A negative credit card balance means they owe you, so using your numbers

 

they owe you -4,000

You charge 1,500

 

math:  -4,000 + 1,500 = -2,500

 

now they owe you 2,500

QB is doing the math correct, your opening balance as a negative is wrong.  Check the opening balance entry, it should show in the account register in the increase column (a credit in a journal entry)

Resolution for Issue 'Entering Credit Card Transactions – Help Please!' available: Yes (Solved).
Source: Intuit Community forum.

Entering Credit Card Transactions – Help Please!: 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.

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