Minecraft could not calculate distance from the player to destination using the /locate command.

In the picture, my location was XYZ: 993791 / 56 / 3008381.

I used /locate command and located the nearest stronghold being at XYZ: 11768 / ~ / 19928 

However, the game calculated that the player is 0 blocks away from the stronghold, which is incorrect.

This is the only structure to be calculated inaccurately, other structures (igloo, mineshaft, mansion, etc) gave correct measures.