Same happening on PS4. Entered on chat and it was small. Changed to medium, left, enterde again and it was large, although the settings said it was medium.
There was a bug in the “Global Chat”, when I open the main map, the chat becomes the same size (that is, the chat has become shorter). And when I open a chat during a fight, it looks like a standard one.
another issue being overshadowed by that pathfinders… places conspiracy hat on its although they have manufactured a problem to hide all the smaller problems