Spawn and delete page field numbering fail

I have a form and on that form I have a custom button to spawn a new page -

var template = this.getTemplate("1");

template.spawn(this.numPages, true, false);

this.pageNum = this.numPages-1;

When I add a few pages everything is works properly, fields are renamed etc.  Once I delete a page say page 4 of 5 pages the page deletes fine.  Page is deleted via a custom button that is on the spawned page -

var response = app.alert("Are you sure you want to DELETE page" + (this.pageNum+1) + " ?", 2, 2);

if(nResponse == 4) {

    this.deletePages(this.pageNum,this.pageNum);

    this.pageNum = 0;

}

Now when I spawn a new page after deleting a page it appears to duplicate the last page I spawned.  It does not rename the fields so it populates the fields with data from the last spawned page, any ideas?