my text moves by itself

[akideracing]

Hello, my problem is that I am trying to make a video lyrics and I give the positions to the letter so that it goes up when that part sounds
but between position and position the letter moves up and down by itself (I'm only changing the Y axis)
For example, I configure a position at the beginning of a sentence and then I put the other position at the beginning of the sentence that follows and 10 frames before I copy and paste the previous position so that it rises quickly and not little by little from the previous position
but between each position and position (they are the same on the Y axis) they move up and down by themselves 😞

[akideracing]

post a video below the post to see what happens

[OussK · Accepted solution]

Select all the keyframes and Right click on one keyframe, then go keyframe interpolation then change all the interpolation dropdown menu to linear, this should fix the problem 

[akideracing]

thanks, that fix my problem 🙌

[Rick Gerard]

The problem is caused by the temporal interpolation of the keyframes. This causes a rebound effect. The easiest solution is to convert the first keyframe where the motion stops to a hold keyframe. That will prevent the overshoot and rebound.

The best solution is to learn about keyframe interpolation and how to use the speed graph editor. Maybe this will help:

[akideracing]

thanks, I have to learn about the keyframe interpolation 😅

[Anna Lander]

When you select the text layers with Position animated, you see a path with smooth anchor points ("input" and "output" handlers are on the same straight line). So when the object reaches the needed Y position, the movement continues a bit, by inertia. Use the Corner tool to set the path between the nearest points strictly horizontal. 

[akideracing]

Thank you 🙏