that means, they get the cardset from the last game played.

Eg: playing memory-16, setting cardset maching,
going to freecell, with cardset default,
going back to memory-16 - it now also has cardset default,

BTW, it would be nice if the games memory-16, -24, -30, -40, -52
each could have their own setting of cardset
(eg default, matching, ishido, matrix, hanafuda, tarok, mahjong ...)