When ejecting villagers out of minecarts, the villagers aren't centred in the block they eject to because they path find for a brief moment even though they are in a 1 x 1 chamber. This only occurs during certain times of the day such as Gathering time, Returning to home time and Working time. They aren't simply getting nudged by the minecart they ejected from as the chamber they are ejecting into is off to the side.