Central insecure form?

Switchblade

When going to https://central.bitdefender.com, LastPass warns me that there is an insecure form on the page. Looking at the elements, it looks like the Submit action goes through Demdex.  Why is the authentication being passed through another site?

 

<XREMOVEDiframe sandbox="allow-scripts allow-same-origin" title="Adobe ID Syncing iFrame" id="destination_publishing_iframe_bitdefender_0" name="destination_publishing_iframe_bitdefender_0_name" src="https://bitdefender.demdex.net/dest5.html?d_nsid=0#https://login.bitdefender.net/central/index.html?redirect_url=https:%2F%2Fcentral.bitdefender.com%2Factivity&lang=en_US&ref=" class="aamIframeLoaded" style="display: none; width: 0px; height: 0px;">

satyendra.singh

This might be because of the funnel being created by the site owners.