It looks like all of my lvl 50s are affected. I do not have Shadowlands. It’s possible that this was related to an armory update to show covenant backgrounds (which does not apply in my case). The armory pages of my toons look fine on Firefox for iOS but not on Firefox 83 for Windows.
EDIT: it looks like toons below lvl 50 are affected as well.
My armory profile is only showing vertical bars where my armory portrait and background should be.
The mouseover armor tooltips are gone. I have to click on the armor item to see the tooltip. I’m not sure if this change is intentional or a bug. I am on a computer, not a mobile device.
My talents are not showing up either. I was going to look up which talents I have to help a friend from outside the game, but those are blank too.
https://worldofwarcraft.com/en-us/character/us/lightbringer/tacothebell
EDIT: Here is a lvl 45 that has the same issue. One of my failed attempts at leveling a horde toon:
https://worldofwarcraft.com/en-us/character/us/thrall/tacothebell
As a side note, I would like there to always be the possibility of showing the racial background on the armory (or the class-based ones for DH or DK). I wanted that option in Legion too tbh. I chose the night elf race for most of my toons for lore reasons and I would like that to show in the armory by using the racial background instead of a background based on the xpac theme (class halls in Legion and covenants in SL).