Yes, information on the make and model of guitar, along with a video showing the guitar played, in a normal playing position with accompanying audio so we can hear the "parasite tone" would be most helpful. Before producing the video/audio, change to a new set of strings of a brand you trust and are familiar with to remove the variable of defective strings from the equation.
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When fretted in the middle of the fret, almost all the strings but mostly 4th and 5th sound like if it were two guitars sounding, being one of them just slightly flat. When fretted just near the fret bar, tones come off perfectly clear.
To clarify, are you saying that the second "parasite tone" you are hearing is almost, but not quite, an octave above the note fretted?
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It is quite clear that the secondary flat tone comes from the "secondary" diapason between the saddle and the point where the finger press the string;
For my part, I'd prefer to discard this assumption about what is happening and where the tone is coming from until I've seen/heard it for myself.
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Yet I'm not a luthier, but i must confess that this issue is shaking much of my knowledge about physics and reality.
Guitars occasionally produce unexpected sounds that may at first seem mysterious. However, there is always an explanation - we don't need to begin reevaluating our scientific understanding of the universe just yet.
