On the Defaults tab of the Form properties, there are a couple of places where there's a dropdown list which allows you to choose an xPage. That list should show the entire xpage name. currently I have 2 xpages which begin the same way but one of them ends with different text. In this example, I have these 2 xpages:
However, the dropdown shows only
So I don't actually know which one it's using. The full name should be displayed here.