Britax Parkway SGLs problems in my 2011 honda pilot

I just bought both of my girls parkways. They were riding in regents. I was planning on putting both parkways in the third row of the pilot. The 2011s are not made like the old pilots and the third row seats 3 and is quite bigger than older models. First off there is only one set of latch in that row. The seat on the right has no issues with the seat belt fitting properly in line with the belt path. It buckles safely without the belt clip setting in the wrong spot. I go to install the other seat and it will not buckle. Not even close to working. So the one seat that would be able to be latched, can't even buckle. If I put the other parkway in the passenger side second row, I can't access the third row. On the driver side outboard is a britax regent that my 4 year old sits in, so I can't put a parkway there. I'm so irritated. I finally decide my 9 & 7 year old are old enough for boosters and it won't even work. I thought about putting my regent and parkway in the backseat, but then i would have to hassle with climbing back there to buckle my son. HELP! Should I return the seats? I want to be able to use all 8 seats in my pilot.

put the oldest in the third row in the spot where it works... put the 7yr old in the second row with the 4yr old... and then fold down (forgive me if I'm wrong in remembering that the pilot has fold down seats in the back) the other 3rd row seat so the 9yr old can climb in through the hatch.