If ya feel you've been paid incorrectly just simply tactfully ask your payroll dept a direct question regarding the matter. Whenever i have a payroll issue i simply call our accounting dept and address it. People even in the office are human just like you an they can make mistakes. Silly to be afraid of repercussions for just asking honest questions about your pay with your employer.
I guess I'm the other end as a fleet owner
...I made my pay scale super simple and I usually don't get any calls about payroll because of it.....I hate any of those complicated pay scales schemes it was allways a deal breaker for me