Probably because you haven't asked Canvas to display them as percentages.
Click on Assignments on the left sidebar, then click on the name of the assignment, then click the Edit button.
There will be a text field with the name of the assignment, a larger text area for the description/problem, then "Points", "Assignment Group", and finally "Display Grade as".
Next to "Display Grade as", there should be a button labelled "Points". Now click on "Points" and a menu pops up, and one of the options is "Percentage". Select it, and save your work.
P.S. In the future, try to be more specific in the subject line. In this case, it should have been something like "Why are my grades not loading as percentages?"
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