Well, I would say that in a country like Poland where right-wing PiS is currently in power Youth want to vote against the corrupt establishment and therefore they vote for left/liberal left.
Same story in Slovakia and Czech rep. but for a long time we had left-wing coalitions in power so majority of Youth is voting for right-wing parties, (maybe less in Czech rep. where there are two big opposition blocs where the one led by Pirate party is modern european left)