Yup. Been there; done that.
ubercart 5.x-1.3
uc_event 5.x-1.0-rc2
Can't seem to shake the duplicate divs. Thought I could hide one via .css; however, they're both defined the same. Inserting div.add_to_cart { display: none; } into my .css file hid both divs.
Still puzzled...