I have a pre-owned 99 Outback Sport. I believe that when the rear seats are folded down, there should be some type of strap to hold them down (or maybe even flat). There's a buckle-looking-thingie on the top rear of the seat, and there's a hook at the base of the seat. If that's the case, does anybody have a couple of the straps that they're willing to part with; or perhaps they're hidden somewhere in the car???
TIA, Rick