Hi @Mojimene,
This is probably something you'll want to talk with your school/institituion Canvas team about. The Instructure Community here is comprised mostly of other users of Instructure products from around the world. Unfortunately, that means we can't acces your Canvas course to really dive in o something like this. Sometimes posting screenshots could be helpful, but with sensitive info like grades, I would definitely not advise that route. Your school/institution team will likely have access ot your course and can take a look at the gradebook with you to figure out where things might be going worng and hopefully get it fixed up.
Hope this info helps!
-Chris
