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Hello, IF your ships jumps back to the start of the starlane, bevor it enters ne new starsystem, then there could be two reasons for this problem. First reason could be, that another race has put a block-item on the one end of the starlane, thats an item with which you can equip your ship. Then the ship jumps back to the start, when it reached the blocked system.
And theres another force which can move your ship back to the start. One race has the skill to send all ships in starlanes in the galaxy to its start.

I hope I didnt fool myself, dunno if you already knew this things.
..and sorry for my bad english, i am from germany