Big O Tires

My tire pressure light came on my vehicle and it said one of my tires was running low> I took it in they looked at that tire repaired it and sent me on my way when I checked the tire pressure the tire that they fixed they filled it up to 41psi and the other 3 tires were not checked and left at 30psi. They did a great job and fixed the issue but seems like an issue when you dont check atleast the tire pressure on the other 3. All these tires have warranties I cant imagine it is good to be driving around with 1 tire with 10 psi more then the others.