I've noticed a small bug with the map on the “My Coins” page.
When hovering over the modern oblast of Kaliningrad (between Poland and Lithuania), the small catalogue sub-section that opens up doesn't show how many coins of the Teutonic Order one has. On the contrary, it does show when hovering over Poland/Lithuania/Latvia/Estonia.
I find this to be a bug, since the oblast encompasses the exact territory that the Teutons crusaded in, including the city of Königsberg that was founded by the order in 1255 and was the seat of the Order's marshal.