Monk, did you notice this info at the bottom of the IP check screen? Could explain the mix up.

Two usernames who consistently show up together in the IP check tool could be one person with two users in the system, it could be two different people sharing a computer, or office network. It does not constitute a violation but is simply additional information that members can use in assessing the credibility of a post.

A user's IP address represents how they have connected to the internet and may change from time to time if they log in from different locations such as home, work, or a cafe. A notebook computer typically changes IP addresses as it connects to different Wi-Fi networks. Many DSL and cable service providers also choose to rotate the IP addresses used by their customers from time to time for various reasons.

It is also common for IP addresses are shared between multiple computers such as on an office network, a Wi-Fi enabled cafe or hotel, and most smart-phones. As such, an IP address by itself cannot be used to positively identify a specific user.