We have an event that that turns cards into these types but since you're saying it's occuring on a NG+ that's very strange.
This smells of an issue with the Browser based version of the game and code not being executed correctly in it. Would that happen to be the browser based version you're trying? I'd have to look at that specifically, and if so, definitely try the downloadable game instead.
Also if you are using the Browser based version, are you doing so from your phone or on desktop?