67 Barracuda Carpet Issue

I’m on track to finishing up my 67 Barracuda interior and have a carpet issue. I bought the car about a year ago and I think the previous owner had the carpet replaced. Carpet fit-up in the front seat area is nice, but the back seat does not sit flat in the feet area and the carpet has pulled away from the sides. I am wondering if this is an installation issue or maybe the previous owner got carpet for the incorrect car. Pics are below, any thoughts on this?

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