Web Page Automation - what triggers it?

I have a web page automation goal set up against some pages on a site and email campaign links send contacts to that site. I have the Infusionsoft tag/pixel/script on all pages. I can see that Contacts are visiting the pages but the goal is not being fired on Infusionsoft (although it seems to have worked once).

I believe it doesn’t work on Safari but doubt many of my PC-based audience will be using that.

I have an Infusionsoft web form on one of the pages listed in the goal but not the others.