I would suggest that you are twisting the strop. Tension at the held end can make the edge of the strop nearest to you, twist up leading to the "flip" for the next stroke hitting this bit first. Make sure the strop stays edge parallel. Uneven pressure across the razor while stropping will tend to twist the strop so that the hook end dips away if too much toe and visaversa. Tension also has to be even through both edges of the strop also as this can lead to edge bias on the strop as well.
PuFF
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