It is the recordings. A soundstage of an audio system does not shift back and forth; it is a set of components that operates within strict parameters. Unless you move the speakers, change gear or cables, it is fixed.
If the movement is so pronounced that it is unmistakably not the recordings, then you have a bad component somewhere in the chain.
There is another possibility; you could have something amiss happening with your hearing.
If the movement is so pronounced that it is unmistakably not the recordings, then you have a bad component somewhere in the chain.
There is another possibility; you could have something amiss happening with your hearing.