Look in your inventory - what does your Matron and Elven Roge look like?
Every delve portal shows rare and legendary as possible drops. I don’t recall (actually, haven’t paid attention) how it looks for fresh delves, but, once you own the cards, the game must be pulling level/traits to display from your inventory - as you see, mine (apart from rarity indicators) are the same in both places
Still, that visual display has no effect whatsoever on actual drops. Use enough chaos shards and you’ll get Matron eventually. For comparison, longest I’ve gone was little over 3000 shards until first legendary dropped.