If you are putting links on your Resource Board that will send users to Community Groups, you need to make sure to use the link that the Parent uses to get to the Community Group. If the URL has "oncampus" in it, this will not redirect the user properly on mobile.
To fix this, impersonate a Parent and click on the Resource Board link to the community group. Copy the URL then go back in as yourself and add the link through:
> onMessage > Content > Links
Click on the name of the Links Category
Select Edit for the Link
Clear out the existing URL and paste in the new URL