Yo, i'm playing on his server, let me try and add some more specifics to what is happening, the thing is, when make the jump you ALWAYS end up one sector short, like if you were at 2,2,8 and you jump to 2,2,2 the jump drive will take you to 2,2,3(and the JD computer also says that the waypoint is in range and he is jumping there). so you will be around 50-70km from your waypoint/destination, and you won't be able to jump again, if you jump again you will just stay in the same place, i have tried to replicate it on single-player without success, so we came to search for help on the forums before reporting it as a bug.
(also should this post be here? can someone move it to the support forum?)