Content can be missing for several reasons. The cards in OneTech are displayed based on the roles that the user has. The user will not see cards that don't match their roles.
There are other factors that might influen e how content in a card is displayed. Session timeouts and private/incognito browsing may cause the content in a card to not display or to display a log in. In this case switch out of private/incognito browsing, log out to establish a new session, and/or clear the browsers cache and cookies. Here is a link with instructions on clearing the cache and cookies for most of the popular browsers -- https://www.wikihow.com/Clear-Cache-and-Cookies.
If this does not resolve you issue contact Campus Support to open a ticket.