eBay not providing lable for amount it caculated for buyer

[kdk8]

The buyer selected USPS first class and eBay calculated a ship fee of 6.78 but when I try to get the label it says it cannot provide a USPS first class label and all the other options are double the cost. Why would eBay calculate a price then not allow me purchase it? My original ship size and weight info is not far off what the actual size and weight is after packing it. In fact, I don't know how to get to the original post to see what I had in there exactly. Now that the item has been sold I can't get into that area of the listing or is there a way? Even still, it is a light object (1 lb 5 oz) and needs a box 12" x 8" x 8". Thanks for any help! I'm stuck! I already gave her a great deal now I will lose any profit at all if I have to pay twice as much for shipping uhg 😕

[disneyshopper]

First class parcel is limited to 15.99 ounces when printing the label.  Therefore, you need to select Priority and you should then be able to print the label.

[kdk8]

Thank you, I just realized I must have marked the package as 1 pound instead of over 1 pound and that is why first class mail was an option. Great deal for her, not so great for me 😞