I am experiencing an issue where, sometimes, harvester ships will continually attempt to return to a single planet/location even after the harvesting is done. At first, it would only do this to planets I had marked for colonization, but the third time it did not. The fourth time, they chose a random location in the middle of an enemy system, outside of any actual systems. The third and fourth times occurred in the same game, with the harvesters switching fully to targeting the deep space location. I made several different harvester hulled ships, some with planet devourers, some without, and it seemed to not make a difference how the ship was actually designed, or where/when it was built. This was in the Experimental build, as it is the only build which has the Ringworlders. It has occurred in all three times which I have played the Ringworlders race. Two times were in dumbbell galaxies, and one was in a spiral galaxy.