Based on what you are describing, your laptop or computer is connecting to two networks. If you are running a wireless network and also connecting a dongle at the same time, you will indeed get two public IP addresses. When you try to surf the internet, the FAST CONNECTION WINS. So, if your dongle is slower, you will never see that IP address in ipburger.com. Disable the wireless when you are using a dongle and you are covered.
I hope this helps!
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