Dataset filter not working

If you had a function that converts the feet and inches of heightPref to a numeric inches field, that would be the cleanest and not prone to the issue noted above. Or you could simply create a lookup collection with those two fields (height and heightInches), populate it with all of the possible heights, and have that be the data source for the dropdown. You would then store the inches the user enters, and that would be the field the filter uses.