Hello, @RachelSpivey !
Thanks for posting on the Instructure Community.

This appears to be a browser setting, as mentioned by @mzimmerman .

This would likely be a setting within your web browser settings, likely called predictive text. I recommend researching how to turn this option off on whichever web browser you use canvas on, and once disabled you shouldn't have any issues in your gradebook.

Hope this helps! Feel free to reach out with any questions!
Noah B.