Hello Kevin208
Sorry for the late reply.
You can enter or adjust the travelers in the SBB Mobile App. Please check if “no discount” is selected for you. If not, you can correct it in the settings or just before buying the ticket.
For more information about the SBB Mobile App or refund requests due to incorrect ticket purchases, please contact the SBB Contact Center at +41 (0)848 44 66 88 (CHF 0.08/min.) or send an email to ticketshop@sbb.ch.
Greetings, VlaznimA.