Dept. of Subtle - Window Tagged Twice

A client recently reported a strange tag situation. When they changed the tag value another window's tag would change too. Not strange to me, the tag is displaying the Type Mark parameter, correct? No they replied, "We don't do that, we tag each window with a unique number so our tag displays the Mark parameter."

Now I'm curious...well it was too easy. The tag was tagging the same window as the other tag. Select the tag, add a check in the Leader Option and we could see where the tag thought its window really was. Here's a video to show what I'm writing about.