Seems it has some problems with asteroid encounter planning when it needs to round kerbin >60 days. I.e. i get a node with close encounter set, coming in 30 minutes, in fact it should be some around 60 days.
Having a node coming in 30 minutes and increasing count of orbiting by xx to 60 days, it switched back to 30 minutes (see my bugreport http://bugs.kerbalspaceprogram.com/issues/13310 which isn't a bug of KSP but of PM).
Might be because it's coming to initial intersection, but which wasn't correct and also couldn't set more than 60 days, which i'd have needed.
Btw. i might add, when switching to a craft with a node and want to adjust it by panel, it's throwing a NullReferenceException[...] until i clicked on the original KSP node gizmo, then it's ok again.
Running Linux64.