I’ve Been Overcharged???

So I was going through my bank statement to check if my refund had finally come through after half a week, and as I scrolled down the list of purchases I got to the purchases I made on July 3rd. The first one for $6.34 is correct, but the second purchase is $8.90, meanwhile the only 2 other items I had purchased that day (besides the 6.34 item) costed way less than 8 dollars, meaning I’m being overcharged.