[Just speculating, but it looks in the image like the chord picker might be assuming the lowest note is always the root of the chord which would lead to some oddly named chords.] <= On closer examination I see this is wrong as there are chords showing different bass notes.
Anyway I wouldn’t trust its ability to correctly name chords since it took one of the most common changes that exists (I-IV-I) and changed it into something needlessly exotic (I-vi#5-I).
Mike, if you are interested in getting more grounded in music theory you might check out Inside the Music by Dave Stewart (not the Eurythmics guy). It’s a very gentle introduction to theory that’s easy to read.