not up-to-the screen

not up-to-the screen

Hi everyone,
Having 3 checkboxes with person names, all of them are checked.
When I uncheck the first name and submit the form (by clicking on button "Speichern"), the expected result is to see the unchecked person now as last item. Instead it still shows up in checked state as first person and the last item gets unchecked instead... hitting Ctrl+F5 reloads the page and everything looks fine as expected.

You can try it out here: Test1

The underlying PHP script is working fine, as you can see that it is working as expected when NOT including the JQM scripts: Test2 (without JQM)

Maybe there is some kind of caching problem? I've already tried some meta tags but no success. Do you have any advice??

rgds,
janosh