Feedback:
41818 - Paste Object(s) with Xojo 2015r3.1 adds an ending number (1) to the Object(s) names
When you Copy object(s) from one window, and paste them in a brand new and empty window, a 1 suffix is added to the Object Reference Names.
I think I saw a question with this bug, some days ago, but I do not found it when I search minutes ago.
I also create a Feedback case for you.