deleting authentication cookie and reloading the page gives download.gz

Hi all,

after login to the webpage, we deleted the authentication cookie from inspection tool on chrome and tried to reload the page for fresh start.

we are receiving the download.gz file upon refreshing the web page. 

any ideas on this behaviour?

can this be solved by an irule? Upon refreshing page we should get a fresh login page.

service in question is F5 LTM.