I also have this problem, no mods installed version 1.10.1.2939, but my map is really glitchy in general (planning nodes sometimes resets the next-maneuver node in mid-burn, saying me to burn for a lot longer than I should, also the graphical maneuver editor don't respond properly to inputs, clicking progade then retrogade, or any other pair, causes the final orbit to change like I just clicked progade twice)
https://imgur.com/a/pLbtDDo