I've got a MIM 50's P that I
love, but spacing between the A and D strings is much larger than the space between the E and A or D and G. When I look at the nut, I can see that the nut is cut in an uneven fashion. Is it supposed to be like this? I don't know much about nuts (insert joke here

) or string spacing. Do I need my nut replaced or should I take some other form of action?
Thanks!