QB Issue Resolution:

Edit that template and go to Layout Designer view to see what is overlapping what. You can try removing here, but if you are not comfortable with this view, then go to Additional Customization to Deselect, save, then Reselect those elements, and they “reappear” in a default position and only once.

Resolution for Issue 'Sales tax field on invoice shows 2 sets of numbers combined.' available: Yes (Solved).
Source: Intuit Community forum.

Sales tax field on invoice shows 2 sets of numbers combined.: 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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