Jesionowo, Warminsko-Mazurskie, Poland (Galacia, Poland in the ship manifest, and from his own accounts).
Jesionowo, Warminsko-Mazurskie is quite a long way in Polish terms from Galicia. That's an inconsistency which suggests that you maybe right - there is something not being said. Equally he could have been born in one place and lived in the other.
For some reason my grandmother is keeping his history a big secret.
It might be one of many things, most of them fairly ordinary. Something scandalous decades ago could be very normal nowadays. If you think there might be a Jewish connection, why not try a DNA test?