I had a quick look at your shop and it looks like first class is enabled for international postage but not for domestic.
You have to tick the box.
There is also allot of weird behavior happening - modules being loaded more than once etc. The integration of shipping estimator into the shopping cart page is a little off. Someone has been messing with the Zencart core module files. Maybe you should speak to the person programming your site while you are at it.


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