QB Issue Resolution:

When you create a Budget, you are asked if you want to assign “Additional Criteria”, so you would Budget By Class. When you run the comparison reporting, you are Also asked if there was Additional Criteria, so you also select by Class.

Run your Budget vs Actuals, to see this.

Resolution for Issue 'How do I run a P&L Budget Performance report for just one class? The filter gives correct actuals, but includes total organization budget figures. How do I fix it?' available: Yes (Solved).
Source: Intuit Community forum.

How do I run a P&L Budget Performance report for just one class? The filter gives correct actuals, but includes total organization budget figures. How do I fix it?: 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 budget figures
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Error Recovery for budget figures [Canada]
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