Since the first set of Eternals were released, my ranked borders have been disabled in normals (loading screen) on most champions.
Long story short, if you try to customize your eternals, you will not be able to use ranked borders outside ranked queues anymore. By customizing I mean changing the order or picking out different ones for display.
This bug has been bothering me for a year now, and I pretty actively sent out tickets about the status of the bug over the first 6 months, but I have since given up an just have tried to live with the fact I will not be able to show off my ranked achievements in normal queues.
I hope the 2nd set of eternals brings more awareness to this bug, but I am a little out of hope at this point.