nuclearace

I'm running MJ 2.0.7 and I'm having a problem where when I create a 'transfer to another planet node' whenever the spacecraft begins to orient to the node the required D/v goes through roof. Say if it was 800 m/s before I execute the node it sometimes jumps to 3000 m/s. It's done this even when there were only a few days to the node. The only solution I've found is to orient to the node, then cancel it, and then make a new node and hope that I can maneuver to the node without messing up the d/v.