I have these factory all-weather mats in my Crossfire and they snap in just fine. I also have the factory carpet mats for my car. I keep these snapped into place and just lay the all weather mats over the top. I might have to re-position the all-weather mats every once in awhile, but it's not a big deal to me. Keeps me from having to keep a set of mats stored soemwhere in my garage.

Per suggestions already provided, I would make sure the snaps are cleaned thoroughly and then identify what condition they appear to be in. Spare snaps can be had, if needed. The mats do take some effort to get them to snap in place & must be aligned well with the locating pin.