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Radial O-ring sizes

Guys, the radial O-rings used in the 3” and 4” series flanges seem to have a lot more stretch than a normal design ?

3” flange has 70.56 dia groove with no. 230 o-ring, 63.09 ID = 12% stretch
4” flange has 95.33 dia groove with no. 238 o-ring, 88.49 ID = 7% stretch

Have I misread (or miscalculated) this ? Normally I’d expect 2 or 3 %.

Cheers
Rich