It looks like the site is requiring one of the trackers to log in somehow. If i leave the shield up and just change it from “standard” to “allow trackers and ads” it allows the log in form to pop up.
The shield still blocks cross-site trackers as shown in the picture but it looks like this website is requiring one of the trackers that is being blocked to run properly.
Testing in Chrome (no adblocker installed), and in incognito-mode, Clicking on Login doesn’t do anything for me. Not sure what I’m doing wrong here.