1st Gen R52 Cooper Convertible Is it my seat or my back?

My seat feels like its leaning to the right (or my back is leaning left ). Right behind the headrest is a seam in the exact middle of each front seat. When I measure from center seam on the driver side to center seam on the passenger side, I get 25 11/16". Would some other people with convertibles with leather sport seats please measure yours and post what you get? Thanks.