I changed my math class, but the canvas still shows the class that I registered before.
Depending on how your school menages enrollments in Canvas, it may take 24 hours before changes to your "official" enrollments are reflected in Canvas. You will want to check with the Help Desk at your school.
At my school, we update enrollments overnight, so if a student drops one class and adds another class through the Registrar, they will not see those changes in Canvas until the next morning.
Retrieving data ...