There's a book I read once that had something like this issue in it. Some navy or other was using reaction drives to go to other stars, and completely ignoring jump nodes (called wormholes

). It played merry hell with everyone until someone actually made a map based on real-space distances and locations.
All the map colors ended up twisted together like some preschooler's crayon drawing. I would conjecture that the map presented is in no way actually to scale. I wouldn't even be surprised if the stars aren't arranged in that order in realspace.
The book is Exodus, by Steve White and Shirley Meyer, in case anyone wanted to know.