The problem is likely that the turnout is twisted -- i.e., the three legs of the turnout are not in the same plane. You should not have a grade going through the turnout as rigid-frame locomotives will take issue with it and some of the wheels will lift out of the track. We had a problem like that with a Ross #8 curved turnout (O-96/O-120) and I had the fun task of realigning the whole area.
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