Fingerings in a chord won't separate with the comma

Would anyone know why this is happening…?

When I try to enter two fingerings over two notes, and both notes are selected, and separate the fingers with a comma, for example, “1,4”, it always removes the comma and puts two 14s over the notes. Why would this be happening? Thanks!

I’m struggling to reproduce this problem, I’m afraid. Could you please attach a little project that would allow me to reproduce it?