can someone tell me if i'm being scammed?

this is my last 3 paychecks, over 3 weeks (i don't know why they split up the overtime ones)the only reason i can think as to why the last 4 are less than they should be would be drive time, as i am paid 12.00/ hour for driving, 6 hours there and back (12 hours total), and they include driving hours with normal work hours and overtime (so if i work 30 hours and drive 12 hours, i work 40 hours with 2 hours of overtime), but the first one still says 15.50 even though i also drove 12 hours, sorry if this is confusing...