Bryan,
When you say you are only hearing the Tina and Lisa harmony and only a few others, I'm thinking you might not be in chordal mode. Are you playing a chord with the accomp. on using chords on the left side of the split point? If not, you would only hear the harmony voices which work when you don't play any keys on the keyboard. The harmony called voice + Instrument would work, Tina and Lisa would work, but all the duets, trios, Jazz harmonys, etc. would not work. Check your vocal setting page and see if you are on chordal, vocoder, etc.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)