Spaceracer

I have a ship in orbit around Kerbin with only a 400m difference between apo- and periapsis and the two tags are just twitching back and forth slightly. Just wondering is there is any way to keep them still.

Hello everyone! Just got KSP a few days ago only have about five hours in game time, but definitely hoping to rack it up quickly! Any tips and tricks y'all have for the new guys are always welcomed!