QB Issue Resolution:

The Product or Service you place on the invoice is what drives the income account affected.  Go to your product and services list and see what income account is associated with the item you’re putting on your invoice.  If it’s the wrong account, you can change it on that screen.

Resolution for Issue 'I set up a revenue account for Consulting Services, but my invoice posts to “Sales” acct. even though the Income Acct selected is “Consulting Inc”. what am I doing wrong?' available: Yes (Solved).
Source: Intuit Community forum.

I set up a revenue account for Consulting Services, but my invoice posts to “Sales” acct. even though the Income Acct selected is “Consulting Inc”. what am I doing wrong?: 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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