USPS recently rolled out some changes
to their priority rates names to make it clearer how long a given rate will usually take to ship. Essentially it relates to adding "1-Day", "2-Day", "3-Day" to the end of rate names.
This can be really useful to customers, but can also be really detrimental if you don't ship your products immediately, as it will lead to unreasonable expectations that can't be met. With that in mind, we've developed a quick snippet you can add to your checkout template to remove those strings, details of that here: http://wiki.foxycart.com/snippets/shipping/remove_day_timeframe_from_usps_rates