Results Slide not working

Hello

I have a module here with a knowledge test in it. The test works fine in FLash but not in HTML5.

If you fail the test it reports this correctly, but once you click to retry and go back and pass the test, the results slide still reports a fail.

I have uploaded the course here, I'm at a loss as to why it doesn't work?

Any help would be appreciated.

Thanks in advance.

Steven