Malformed ZCC Login Page

I upgraded a ZENworks zone 2020U3 to 23.4 today and the ZCC login page looks different than any of the other zones I've upgraded to 23.4, including another where I went 2020U3 >> 23.4. Appliance is fully patched, and everything else appears look correct and be working correctly. Here's what I have:

 instead of this: