@Andreanne Drolet - Greetings from Saskatchewan! /=S=/

If by app you are referring to the Miro desktop app (and not the mobile or tablet app), you could try resetting the app data by following these steps:

https://help.miro.com/hc/en-us/articles/360017572854-Desktop-app#h_01EVGAY54JY5E9S7J62FRCX6D4

If you are still unable to resolve the issue on your own, and you have a paid subscription, you could open a Miro support ticket by following these instructions:

https://help.miro.com/hc/en-us/articles/360020185799-How-to-contact-Miro-Support#h_01F010RXA0E1S9C0WFQYX75R6C