ksp bug

[yomaha15]

Hello I play a ksp and I have a problem when I make for example a trajectory that starts from kerbin to go to a duna when I change from the orbit of kerbin to that around the sun it changes the appoapsis around duna without I put any push and rcs it always changes  the altidude of my orbits no matter the celestial body every time I change from one orbit to another is this normal? how then I settled get problem (I play on ksp steam 1.7.3.2594)thank you!

[AHHans]

There are some rounding errors when you change from one SOI to another SOI. These can easily change your orbit at the other end of an interplanetary transfer.

I believe the errors are minimized when you don't have the transiting vessel in focus (or within physics range in general).

[MechBFP]

Slowing down before you exit an SOI also helps. If you download the “Time Control” mod you tell it to warp to “SOI” which will help a lot.