No Optimization?

I was having a weird problem where my thing was not able to optimize. It was so weird. For high cdf values, it just couldn't improve the solution. I think after toying around with it today, I figured it out. when you increase the cdf value past a certain point, and the items were made to be 3 per bin, then the items have to be 2 per bin because they're all too big for the 3. So, you get a point where you can't optimize.