Yeah - that doesn't make sense. If it's going to show all the options, than what's the point of having "options".
Anyhow - I'll chalk this up to a feature not available yet.
Please look at line 347 of Product_Results.php and remove this from the end of the query:
WHERE COALESCE((SELECT GroupingID FROM productoptions WHERE productoptions.ProductID = products.ProductID LIMIT 1), ProductID) = ProductID
Note: When you remove these restriction, then all the individual product option combination will show on your results page, and depending on how many products you have, this could be a long list.