90% of the time when I see doors that are not straight (out of square with the case), it is a leveling or racking issue. Shimming out or more of the case corners will draw the doors into alignment. Try pushing or pulling on the upper front corners and see if that works.

The other 10% of the time it's hinges that need to be adjusted one way or the other. Are these Euro cup hinges? Often they have a built in adjustment with turning one of the adjusting screws. You can sometimes adjust non-Euro hinges into alignment with shims of cardboard behind the hinge plates.

Of course if the problem is really mis-drilled holes, you'll have to re-drill them. Fill the old holes with toothpicks and glue, let it set up, then re-drill the holes.