Help with shipping

[lkfun]

I chose UPS ground for shipping and the buyer was supposed to pay for shipping. Yet when I went to the UPS store I had to pay $30 to ship. When they asked for the prepaid shipping label it showed USPS even though I chose to ship thru UPS. The buyer chose USPS. How do I avoid this in the future? I like using UPS because they are open long enough for me to go after work. 

[disneyshopper]

Your 2 active listings show you ship using UPS ground.

Your Yeezy Boost sold listing shows Secure delivery with tracking, so I guess that means the buyer was able to select USPS. 

So are you going to Void that USPS label?  You only have 5 days to do so.