Thanks @Alec for bringing this to my attention. I had noticed some oddities recently since 2.5.0.beta6 with spacing below headers, on some Discourse instances I run where I had made the header bar taller to accord better with a site design, and had put some padding in to push #main-outlet down a bit. After 2.5.0.beta6 this extra padding wasn’t needed any longer.
I’ll look into what I need to update to fix this, when I have time. I have 2 instances which use this TC, and although one is looking a bit weird, the other is fine. And of course, PR welcome on a fix if anyone’s got the time.
Thanks @justin for the pointer on fixing.