If you have implemented variations as part of an item set. Constructor will always select the top ranked variation to display from the item set.
When a boost or bury rule is based on variation-level attributes, only variations that match the boost or bury rule will be affected. This will change the order of the top ranked variation in the item set to display.
In order for the overall item set to be boosted or buried, the rule must match all variations in the item set.