The card charges (second row) are displayed as if U3 is applied with all charges, but only on the outline. The card abilities do not have any stars (*) though, This is always the case even if there is no upgrade or charges applied.
However, cardcharges are litteraly U0 cards charging the upgraded card up. So they should be U0 like they are in your Inventory (see image below).
Did this in suggestions since I'm not sure if it is a deliberate decision or a bug. :^)