I believe similar bugs have been reported before, but here goes anyways. To reproduce:
1) Dock at a station, take an escort mission.
2) Undock. Escort course is autoplotted.
3) Go to your map (while undocked) and plot a new course (possibly arriving at the same destination with stops on the way).

Expected result:
Jump Point marker may move, but it will still be at a jumpable location.

Actual result:
Jump point moves from a jumpable location to a spot near the station (can't jump from it).

Note:
Probably not a high priority, but figured you guys should know.

A screenshot of the bug can be found here.

At least I assume it's the same bug (the shot is, as the post indicates, from about a year ago).

For the record, the bug is completely reproducible as described. I just did it again.

Found the bug for this problem. It'll be in the next update. Thanks for explaining how to reproduce it.