Price glitch at Walmart

Vi

Went to Walmart today. Started ringing up my items at self checkout. The Huggies snug and dry size 2 pack of 38 was supposed to ring up 8.72 it rung up for 4.00. I went back and got another pack. I'm trying different kinds of diapers right now, not sure if these will work for her. Just thought I'd tell y'all in case it was the same at your Walmart.