If you are seeing a wider section aft of the center, it is not a symmetrical canoe.
And thanks for verifying @memaquay - measuring these overhead views end to end on the canoe and finding exact center (not the yoke) on these canoes listed as symmetrical it looks like on some, the widest part is 2-4” rear of center (about the width of 2 yokes or so, max). But I suppose it is possible the photo is in some way not an accurate or up to date representation.