On console versions (I have only tested this on Nintendo Switch, but I assume it works on other consoles as well) you are able to move cards with the joystick just like you would with the mouse on PC.
However, on console you are able to move the cards out of the screen by simply holding the joystick in that direction, which very slowly over time fucks up the game's rendering system.
I cannot precisely tell how it works, but the edges are copied while the main screen "zooms out" while the rest is moving along. at some point, the main background is moved out of the screen, revealing the black backdrop.
I do not want to report this as a bug, as everything you see can be fixed in under 5 seconds by simply letting go of the card you are moving. (it does take some time for the card to return to its original position but that really is the only actual thing that may be an issue)
more screenshots here: #🎙・server-chat message