This usually happens when you run a scan with Registry Booster without performing a repair after the scan.
The "errors found to date" counter automatically increments after the scan adding the amount of errors found, irrelevantly if you opt to fix the errors or not.
If you do not choose to fix any/all errors found, these errors will be detected again during the next scan, and the "errors found to date" counter will increment again. This scenario is common when running Registry Booster under trial mode, where usually hundreds of errors are found, but only 15 fixed.