Hi,
there is a bug with a setting in Kerning, applying to text styles.
For instance: if I apply the text style Body, that's based on Base and if I check the Kerning (Position & Transform), it can't be right. In Body, it says [No change], that's fine. In Base, however, it says 0 0/oo. This 0 0/oo should be Auto as it is on a Mac. However, if I switch to Auto on a PC, Kerning disappears. So, you seem to have mixed the settings.
This bug does not apply to the Mac version of Publisher and I assume, A Pub on Mac behaves as intended.
Kind regards
Johann