DL&W Pete, from the picture it appears the flange is hitting the rail rather than just riding up on the frog insert. That is likely happening because the clearance of the guide rail prevents the tread of the other wheel wheel from contacting the rail when passing through the guides. This is the reason it is better to use the high rail version of the FV turnouts and add a thin plastic shim to the guiderail so both scale and high rail wheels will work.
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