https://community.monzo.com/t/a-new-look-for-the-account-tab/57705
I imagine its only temporary till this goes live and probably just a side effect of some things being in flux between the two designs (it looks like the new stuff is getting capitalised, wouldn’t surprise me if they wanted to update the pin/card number string sooner to be clearer but didn’t want to have to change it again to capitalise it so soon after!)