Delivered IScript - how is it getting executed?

HCM 9.1 bundle #7, PTools 8.59.07

HCM 9.2 PUM Image 47, PTools 8.60.07

We are converting to 9.2. I'm testing a custom ESS page in the 9.2 environment. The issue I'm having is "Return" button on the page that executes the GetPortalHomepageURL() function, is not working correctly (ie - bringing me back to our Landing page, which is also custom) - it is redirecting me to a "Company Directory" page instead.

In tracing both 9.1 and 9.2, I'm seeing that in 9.2, after it does the above function, it then executes IScript_HPDefaultHdr WEBLIB_PORTAL.PORTAL_HOMEPAGE.FieldFormula - I have to assume this is sending me down an incorrect path as I don't see this in 9.1 trace.