why does security certificate keep popping up

That is enabled is Anonymous (I looked for active directory client certificate authentication and it is installed but it is disabled) I have a development server which looks to be setup the same way, and I don't get this pop up. If I hit cancel or x out of the pop up the site works as expected, but if I hit ok and select one of the certificates I get access denied. I always make sure 'permanently store this excpetion', before clicking 'confirm security exception', but it doesnt seem to work, as a few minutes later Ill get exactly the same pop up again, for all my. im constantly getting asked, sometimes several times a minute, to 'confirm security exception'. The option of two different certificates local to my workstation. i keep getting asked to add security exception. I have a web site under iis 10 that has a standard InCommon certificate but when I browse to it a pop up comes up from windows security asking to select a certificate saying the site needs your credentials than gives me

Why does security certificate keep popping up