Motion tween ease adds small motion gap between 2 instant frames

Trying to animate a loop of a moving pattern that gradually speeds up, it has one from at the start and 2 frames at the end, ! being the end position and 1 being the restart position. But as I applied an ease that does that, it seemed to add a minor gap between the two frames together where the pattern moves in reverse in a few frames, how do I make in instant instead while speeding up?