What kind of approach did you enter into the “FMS”? I am not talking about the ILS freq and/or course on the RAD NAV page but the approach type on the FPLN page.
Btw, it is not normal to enter an ILS freq and course on the RAD NAV page when flying an Airbus. Aslong as the correct ILS approach is programmed it will auto tune the ILS. Also make sure the LS button, next to the FD button, is selected.