u/darkhorsegt

I may have missed something regarding eBay and USPS postage. I use the eBay postage to print my labels. I noticed today while mailing some boxes out I got screwed on shipping postage. What’s even worse for example: I listed postage on the item listing as 3 pounds and 10x10x10 box. It really was only 1 pound and I used a 6x6x6 box. I still owed more than the seller paid. I am usually good at weighing and measuring ahead of time. And I never notice I pay more than the buyer. But today I had three boxes over estimated in the listing and I still lost on shipping. It’s only ground and all the boxes were ground on the listing and my postage. I have been doing this for many years. Maybe I missed something on my listing? Did I miss something new about using eBay postage? Please enlighten me because I had to have done something wrong or missed something.