Difference in issue severity showing in extension vs Deque university info

Steps to reproduce:
When launching a test page: http://abcdcomputech.dequecloud.com
Run `axe-expert` or any other extension, for some of the issues,
the severity of the issue mentioned is "Serious". But when we click the "More info", and navigate to "Deque university" page, there, "User impact" is shown as critical.