Kerbal Space Program

I've only encountered this bug going flying to Laythe but that's pretty much the only planet I've going to. When ever I load a quicksave, or 95% of the time, my speed changes, for example as I was coming in to dock I smashed in to my Laythe station so I reloaded the save. I was coming in but still a few kilometres away. My speed was visibly changing and my encounter was getting farther away. It also happened as I was coming in the Laythe's SOI my apoapsis kept getting lower and this happened several times as it's hard to do a good aero brake around Laythe and I kept having to reload