That's just the way it is right now. I don't think segments get auto generated, so what you're seeing has actually been created by two legged critters who rode those segments.
Strava does auto-generate segments for climbs if nobody has laid out the segment already.
RRuff, create your segment, and make sure to check on it from time to time. Once enough people start clicking "show hidden segments" and then click on your nicely named segment strava will start to automatically figure out that it is the preferred segment and the other one will sink down to oblivion in the list. Might take months for this to happen if nobody is using strava but you.
To help things along, hover over the auto-generated segment in your ride results list and click "HIDE" over on the right of the screen. Then, click "show hidden segments" and click "unhide" on the one you created. Again, this hints to strava what it should do in the future.