There is nothing to fix. It is by design. Dan mentioned in his GDS 2016(czech only) speech that every piece of furniture has unified size e.g. all chairs and tables have the same height, doors have the same width and height. This has everything to do with the NPCs having the same height.
In KCD NPCs have very complex daily cycles during which the interact with various items. For example you have a 6ft tall farmer and his 5ft tall wife. They have similar cycles, use, pick up, drop same items but the animations are designed for just one bodysize. If they were designed fot the tall guy, his short wife couldnt reach for the pickable items. What now? Add animations for standing on her tiptoes? Make her arms unnaturaly long? Pretend she is a Jedi and uses “the force” to compensate for her small stature?
Or sitting on a chair. Either the wife is sitting with her legs dangling 5 inches in the air or the farmer has his feet 5 inches under the floor. The only solution is to make unique animation sets for every bodysize.
But how many heights? Just the two? Man are tall, women are short? Not very realistic. Women can be taller than a lot of guys. I would prefer at least three different heights(S, M, L). That means three times more work, money and time spent on it. Is the value added realy worth it?
Similar problems would arise in the combat system. If you stabed normal-sized enemy in the face, the hit would land where it is supposed to, but a tall knight would be hit in the chest and with a short knight, the same hit would land in the empty space 5 inches above his head. Not to mention how their different reach based on the different length of their arms would affect the combat. Solution? Adjust all animations and combat calculations based on their height. S vs M. S vs L. M vs L. For every weapon! Easy peasy. KCD would proudly release in 2020:-)