Country Caching Contents HTTPS URL problem

When viewing: Settings -> WP Super Cache -> Contents -> List All Cached Files

The URLs shown in the KEY column have the SSL port appended to the domain:

Example
——-

URI: http://www.example.com/some-page/?v=7516fd43adaa
KEY: http://www.example.com443some-page/?v=7516fd43adaagzipUS

Screenshot: http://i.imgur.com/KBAnQQ7.png

Notice the “com443”.

The site protocol is HTTPS, any idea why the PORT is being appended in such a fashion and as to whether or not this can cause a problem when serving cached pages by geolocation?

https://ww.wp.xz.cn/plugins/wp-super-cache/