Kerbal on ladder in EVA causes orbit to degrade around the Mun
For whatever reason, once a kerbal goes on EVA and stays on a ladder, the orbit of the craft they are on begins to degrade even in a vacuum. SAS is on by default for the kerbal, turning that off had no effect.
Attached is the save game. There are two craft in orbit around the Mun, The smaller, more regular, orbit, is the one with the kerbal.
Good thing I gave this craft WAY more fuel than it needed...
Steam KSP 1.11.1 + DLCs
Its not degrading the orbit exactly. The Kerbal was contacting the solar panel above its head, which caused 'thrust'
Kerbal is applying force against parts it is contacting when on a ladder causing the craft to change velocity. (tested on mk1 pod ladder and Pegasus I Mobility Enhancer)
'27277 QS Tester.sfs' is from the video above for testing.
If SAS was off then the kerbal will cause the craft to spin because the force applied is off center