cant have more then 99 of a type of card.
i used up all of my +100 fight cards so i uploaded my save then "enabled" the cards & items.
loaded up my save and at first it showed 0/127 i think, then went back to 0/99
so im guessing the game only lets have have a total of 99 of one type of card max.
even if you have it equipped it still counts as it being maxed in your inventory. =[