So this is not the usual question that's been asked a few times regarding the spring attack silliness.
In threads about said silliness, it's often said that the because you get a bonus feat at 1, 5, 8, 11 you don't get one at 6 and 12 as you normally would with a standard cavalier.
My reading of the archetype is that you get bonus feats at all of those levels:
PRD wrote:
Bonus Feats: A gendarme trains to be a mounted terror, almost to the exclusion of all other abilities. He gains bonus feats at 1st level, 5th level, and then every three levels thereafter, but must select these bonus feats from the following list: Improved Bull Rush, Mounted Combat, Power Attack, Ride-By Attack, Spirited Charge, Spring Attack, and Unseat. If the gendarme has already selected all of the listed feats, then he may select his bonus feats from those feats listed as combat feats. This ability replaces tactician, greater tactician, master tactician, and the standard cavalier's selection of bonus feats.
That says it replaces the tactician chain and the selection of bonus feats. Not the entire bonus feats from the class, just the list of feats you can select from.
The more I read this archetype the more I find it to be really poorly written.
