What is the settings of your most viewed widget? Take a screenshot.
Wierd, that looks correct. I also try the same settings on my test site https://lesterchan.net/wordpress/ and it works fine.
Maybe it is a theme conflict? Does it work on the default theme without any plugins activated in the first place?
My guess is some plugins or your theme might be modifying the WP_Query or they did not do it properly.
I haven’t changed my theme lately although WordPress and several plugins have been updated.
Is there anyway to fix it? I’m using a different plugin for now called popular posts but want this back up.
Sorry I don’t have a solution. Another potential conflict is that another plugin/theme is using the “views” under the post meta and hence the plugin has issue sorting the views. I have seen some themes use the custom field key called “Views” and this plugin uses “views” (note the capital V). That will have problem sorting the posts as well.