No Validation/Suggests on delivery address when using iCheck

[suabo]

We are using a custom theme and are using icheck for better looking checkboxes across devices and browsers.
Since there is a hook on the checkboxes change event to decide if delivery address needs to be validated/suggestions are made or not, the delivery address in our shop will not validate an there is no suggestions. ICheck uses the event ifChanged instead of changed.

You can see the problem here: https://www.gutschild.de

Since there is only a uglified version of the java script file I couldn't figure out how to bind the needed calls to iChecks ifChanged event.
Can you please assist me on how to get this done or provide another solution?

If you klick fast enough, maybe the iCheck initialisation isn't finished yet, to extend the delivery address, then it work's. I don't know why?