MovieLens does not seem to be sorting correctly.
When I view the list of top picks for me, and chose the sort option "recommended", I notice that the sorting does not entirely correspond to the predicted star ratings. For example I have several 4 star predicted movies mixed in with 4.5 star movies in the sorted list.
Thanks for the bug report.
That is actually by design – we now take a number of factors into account when building lists of recommended movies. Predicted rating is the most important factor, but no longer the only factor.
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Anonymous commented
This is not right, confusing and looks like a bug. It's good that you've updated the algorithem, but if other factors are now stronger, they should be represented inside the final stars prediction. We experience the strength of the recommendation only through the stars, so the stars should represent not only the predicted rating factor, but the final prediction after all calculations.