Easy fix

If you have an action button by an entry, there should be no need to select that entry. Here's an example. I selected "Register" next to one of the items. A message popped up as shown. (A further issue with this interface is that the checkboxes are in the header and don't look as much like list items - could be confused for a graphic element.)

My assumption is that they wanted to keep the Register button close to the items, rather than scrolling down the page, but it backfired a bit.