That could be something to do with it glen, not on the leather necessarily, but with the fabric, the weave could be not parallel this along with the razors relative angle to the strop, could have something to do with it.
By relative angle I don't mean that the spine or edge is lifted, but that the stroke tends to be slightly windscreen wiperish (al la jimbos extreme stropping vid).
Also if one side of the blade had been bent over slightly by my beginner honing that would do it too. Though I seem to remember the phenomenon before I self honed.
Anyway, stropped the same razor again tonight and it seems to be pretty much better now.
Thanks again ed.