Anyone else constantly getting additional shipping charges?

[farmg-8]

Seems like everything I ship lately, I get a notification days later about being charged more for the shipping because of zone adjustments. What is happening. This is ridiculous. 

[comics-scifi-collectibles]

@farmg-8    I'd like to help you figure out what's going on.   

Can you tell me what shipping method you are using?  Fed Ex, Priority, Ground Advantage?   I see Priority on a lot of your listings.  Do the package types match your label... for example you can't use a Priority Flat rate package with a calculated shipping label.  

Are you entering your own package weight and sizes accurately on the listings and double checking them before you buy the shipping label?   

Do NOT use any of eBay's suggested shipping prices as those are always wrong.

I look forward to hearing back from you.