same thing happens. i never press orbit buttons when i try to get an elliptical orbit. what happens if it matters is the orbiter will orbit smoothly but on every orbit the eccentricity drops to like 9/10 of what it was.
Strange. But i know is this possible i show you
1. Launch "Universe Sandbox"
2.Open "Our Solar System"
3.Change Mass of Sun from 1.00 suns to 0.70
4.The orbits of plants should more eliptical