You're right, that doesn't seem to be working as it should.
The first thing I would do is take a close look at the GNG.que, especially the skip-to fields. If a skip had been accidentally added or left in to the experiment, that might explain why you're seeing this behavior.
If it's not that, I'd recommend you attach the files in question. It always helps to try these things on a different computer, and another set of eyes glancing over the files might catch something.
I'd be happy to look at them today if you uploaded them.