The Dink Network

In the cases where it works, it works perfectly - you can hit the bonca as much or as little as you please and it'll still regenerate 10 health every 2 seconds. What I can't figure out is why it doesn't work part of the time. To be more specific, it never works unless there's more than one on screen, and then only on all but one of them.

Hell, I guess I could work around this by putting an extra one offscreen somewhere?