Coins to upgrade cards ive already got?

Just had a look at carss in Eacape and Horde and it is prompting me to upgrade them in big blue flashy letters. But in closer inspection it would seem i would have to soend coins to do so. Is this a con? Or is it something to do with the fact I didnt max the card out before the change to coins/scrap like totems?

Think it’s just a GUI bug, once I got cards for the new skills then I could upgrade them for free and that Upgrade Available went away.

Will probably be some minor patch in the coming days to fix stuff like this.