Pagination issue - Category page (with Page List Block) does not display as expected

Not sure if this is an issue with the Theme Viewport, Category Page and relation with Page List block, (or page list block itself) or custom templates or Pagination Navigation or a cache issue.

Issue: Category Page with most recent articles (Page Block with pagination page 1) not showing when Category page "Re-accessed" - appears to show the last Page Block contents.

Note: Happens with "no custom" templates. We also tested with the Theme Viewport creator and it may appear to be an issue with the original Page Block List

When accessing a Category page showing a Page List block of articles where i have specified 10 articles per page and indicated "Pagination" the "Previous, 1,2 Next" (page navigation) appear to work. But....when I leave the Category page and then come back to the same Category page - content Page List Block that shows is NOT the "first" set of articles of the Category. Note: I've even gone back in and played with the navigation and went specifically to the first page and left that as the "Last" page displayed exited the category page and then accessed another, then came back and still the Page 2 shows as the initial display - Not the page with the most recent articles as expected. Also the Navigation controls are set to the 2nd pagination.

My Testings -
(1) Access Category Page (first time) shows correct page list (1st pagination) of most recent articles.
(2) Use Navigation to access Next (or numbered) page - results in proper page.
(3) Exited Category - accessed another category - re-access Category - results in - NOT the first pagination being display
(4) Exited website - cleared cache - reaccessed Website / category page - still NOT the first pagination as expected.
(5) Access development environment and cleared cache - - still NOT the first pagination as expected.

Sample link:http://www.markhamtoday.ca/index.php/weekly-features/wok-coo/...