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Could be an AVC issue. AVC or automatic volume control is meant to retard the amplification factor of the RF and IF stages on strong stations so that the volume of stronger stations better matches that of weak ones. It could be insufficiently retarding amplification on stronger stations resulting in signal overloading. If it bugs you then check the values of the resistors in the AVC feedback system (usually gets it's input from an extra detector diode that is not part of the audio signal chain), and those in the RF and IF system if any are outside of tolerance then it could affect AVC opperation....However it is good to know when to quit.
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