12 Nissan (Pesach)

In the Ma Nishtana the second question is "Shebichol Haleilos unu ochlim shiar yerakos haleila hazeh marror" (on all other nights we eat other vegetables tonight- marror). Why does the child see anything strange about the choice of vegetables? We have karpas and marror so it should just look like we're having a random selection of vegetables! Also according to the Haggadas that have the girsah of Kulo marror, what does it mean we only have marror? We have whatever vegetable we use for Karpas!