How do I NPC characters to follow and repeat player platform

I am creating a platform game where the player controls a character and three other allies follow repeating their movements.But during the game they are shaking, I do not believe that is due to the origins points, but by logical storage of the coordinates of the character controlled by the player. How can I fix this problem?

tavernasetormentas .bitballoon .com

The player controls the yellow soldier, and stores your x and y coordinates all the time, while the first follower after a second constantly switches to the positions in the matrix. In turn this follower stores your coordinates and the second follower assumes his position and repeats the process for the last follower. but as the link, they are shaking, how to solve this?