Error of software Testing

In the last semester of the web development of the big job, I encountered an impressive error, I write the paging processing when the PageID set to the session parameters, resulting in different page pagination processing is not displayed correctly.

Because opening a page that requires paging will set the PageID to the second page that needs paging to display the wrong page.

This error causes the number of pages in the second open page to be displayed incorrectly in the same session, opening two pages that require paging.

I stumbled across the problem in one test, and finally the PageID was set in the request and it was not retained throughout the session, but once the page went to another page, it failed.

Error of software Testing