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By flop I meant that, for example, when pushing the bike holding the saddle there is a tendency for the wheel to turn to the side... this tendency is accentuated when going slowly, and easily results in the wheel turning to its maximum extent. It doesn't make sense given the spec, unless the components are not actually as specced (unlikely as all reputable makes). Any other factors I'm overlooking?
...did you turn your fork the wrong way around/happy hour on the pub/riding tandem on rear seat?
Everything is kosher as you said