When clicking the "Add" button on the topic source url tab it will insert multiple new values instead of one. The number that are inserted is equivalent to the number of saves performed before changing views.
- Open new topic and click "Add" and only one new value is added.
- Open a new topic, make a change, save, go to the source urls tab and click "Add" and you get two new values added.
Note: I'm guessing this probably has to do with a click handler not getting cleaned up properly.