@LisaOchieng ...
I assume you are an instructor? If so, have you tried making sure that your browser is up-to-date? Or have you tried using a different browser completely? In generally, I recommend using either Google Chrome or Mozilla Firefox. You can also check on if your browser meets the requirements by going to this page: What are the browser and computer requirements for Instructure products?.
Another suggestion would be to try clearing your browsing history/cache. Once you do this, close your web browser and then re-start your browser. Log back in to Canvas to see if anything has changed...hopefully for the better.
Give these things a try. Hopefully you'll have some luck. Please keep us posted...thanks!