Hello Saroilea13
Basel Bad Bf is a special case, this station is exploited by the Deutsche Bahn (German Railways) and not the SBB. The platform number was probably not communicated due to a technical problem. I have observed in Germany that the local informations on displays are more accurate as those in the application.
I would never rely on Google to get actual informations.
A hint:
Bus or tram stations have always two parts separated by a comma, for example “Basel, Badischer Bahnhof” is the tram station, “Basel Bad Bf” is the train station.
Kind Regards
Danhiel