You may have learned one of the above 5 variations in technique/required procedure and you operating at this particular airport required another.
However it sounds more like a technique issue on the part of the instructor.
The instructor should have said what they were doing and why, otherwise there is no actual instruction...
If they were signing off on a check ride and had any doubts, they should have stated them clearly.
Otherwise, they aren't doing anyone any favors, not their employer, not the potential customer.