I have a Polo 6r trendline which comes with the below headlights:

i have recently gone and bought myself a set of Polo comfortline headlights from a friend which looks like this:

I tried fitting them with new bulbs and all but I cant seem to get the high beam and low beams to be on at once. If i switch to high beam , the low beam switches off and vice versa.
Does someone perhaps know why? I know its not the set of headlights because I tried my wifes headlights (she has the comfortline) and that has the same issue.
Thanks for takng the time to read!