It appears you have two Shipping Rules set up for Country:All Countries, so that is offering two different rates for non-US buyers. You have only one rule for Country:US, so that is overriding the All Countries rules to offer one rate for US buyers.
One All Countries rule is applying a custom rate of 1.10 per ounce, while the other rule looks up the rate for USPS Cheapest (First Class vs. Priority). Each of those rates separately get added to the Cost(s) you've specified for any Package Type(s) specified for items in the buyer's order, thereby arriving at the final choice of rates offered to non-US buyers.
To remove one of those rates, just go to Seller Admin > Cart Shipping Settings, then click Next to proceed to the shipping rules screen. When you select a rule in the Existing Shipping Rules menu, the calculation method for that rule is displayed just below the menu. Select the rule you wish to remove and click Delete, then Yes to confirm. Then just click Back to Admin, and you're done.