One other possibility - some turnouts have VERY wide gaps in the guardrail - thats the (often plastic) "rail" on the other side from the frog, which doesn't "pull" the wheels far enough over to clear the point of the frog, The cure is to either stick a VERY thin strip of styrene vertically between the guardrail and the outer rail so that it is tight against the guardrail, or wrap a 0.005" strip of phosphor bronze strip around the guard rail and ACC it into position. an email will get you a picture! Either way what you are doing is reducing the gap so the wheels are pulled across.
Shortliner(Jack)away up here in the Highlands