Artifacts in mp3 encoding

I have been using itunes to encode audio recordings to mp3 for years but recently I have started to get artifacts appearing in the recordings. It looks like it is some kind of cross talk from one channel to the other (eg left to right) If there is speech on the left channel there is some faint twittering on the right. In the aiff version there is nothing, the twittering only appears after encoding to mp3. I usually encode to 128Kbps stereo. Any ideas on what is happening?

Is this truly something that has suddenly started happening or have you just started listening to tracks with true stereo isolation? Very few stereo recordings truly have all of one signal coming through one channel an nothing through the other.
In the mp3 encoder settings try toggling between joint stereo and normal. Part of mp3 space saving assumes that much of what is coming out one channel is similar to the what is coming out the other. It is redundant to preserve this separately so channels share some audio signal which can be stored jointly. I have zero familiarity with the encoding but am throwing out the suggestion that maybe in the case where you really have complete channel separation perhaps this joint method is allowing something to leak through to the other since it works on the principal that both channels do have similar information. "Normal" stores the two channels separately but also takes up more room because of redundant information storage.

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