In the Sectors/Gemini folder, open the Junction.system file with notepad.
Find the lines:
<planet name="Jump_To_Castor" file="jump.png" alpha="ONE ONE" radius="256" gravity="0" x="5000" y="-22000" day="240" destination="Gemini/Castor"/>
<planet name="Jump_To_Gemini" file="jump.png" alpha="ONE ONE" radius="256" gravity="0" x="5000" y="-22000" z="20000" day="240" destination="Gemini/Castor"/>
Change the 2nd Gemini/Castor as follows:
<planet name="Jump_To_Castor" file="jump.png" alpha="ONE ONE" radius="256" gravity="0" x="5000" y="-22000" day="240" destination="Gemini/Castor"/>
<planet name="Jump_To_Gemini" file="jump.png" alpha="ONE ONE" radius="256" gravity="0" x="5000" y="-22000" z="20000" day="240" destination="Gemini/Gemini"/>