I agree that there may not be anything dastardly afoot and errors are not uncommon on auto history reports.
But, when differences in odometer readings are noted, the differences tend to be that the auto history reports show
less miles than the odometer shows. This type of difference is generally not a worry. It only means that the reports that have been pulled are not current or updated.
When the miles shown on a history report are significantly
higher than the odometer shows, however, that often indicates a roll-back of the odometer on a vehicle (i.e., auto fraud).
More details would be nice.