Hi Goldy,
I'm sure there are a few excellent vocal instructors in Nashville, check a few out, someone should be able to isolate your problem and rectify it.
In the meantime, even though I know it's simple and you probably have done it, take a piano or guitar and make yourself sing scales with the instrument, then find an interval and harmonize with the instrument, keep checking your intonation with the note being played . . . boring but works. You gotta get it in your ear, the vibrations of harmony notes.
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