<p>It's because of spatial interpolation.  Here's a previous answer:</p>

<p><a href="https://video.stackexchange.com/questions/14687/object-moving-to-a-position-i-didnt-specify/14697#14697">Object moving to a position I didn&#39;t specify</a></p>

CC BY-SA 3.0
2015-05-07T09:58:41.070Z
2015-05-07T09:58:41.070Z
2017-04-13T12:46:08.110Z
tomh
<p>I have an animation in After Effects where I am animating a slider to move up and down at certain points. The slider should be mainly stationary, but moves occasionally in line with other actions on the project.</p>

<p><img src="https://i.sstatic.net/sK56t.png" alt="enter image description here"></p>

<p>What I am finding though, is the slider is moving a small amount even when the keyframes are set such that it should be static. E.g. the following two keyframes are the same (Y position = 524.6) but if I move the marker in between, you'll see the value deviates from this. (As a result the slider moves.)</p>

<p>1st Keyframe (Y Position = 524.6):
<img src="https://i.sstatic.net/yZrVb.png" alt="1st Keyframe"></p>

<p>2nd Keyframe (Y Position = 524.6):
<img src="https://i.sstatic.net/5EJFt.png" alt="2nd Keyframe"></p>

<p>In between (Y position varies, up to 525.4):
<img src="https://i.sstatic.net/ihVtB.png" alt="In between"></p>

<p>This is driving me nuts! As far as I can see the anchor point does not move, so I don't understand why this should happen.</p>

CC BY-SA 3.0
2015-05-06T16:07:56.137Z
Do you have a splined move between the keyframes?
Jim Mack
CC BY-SA 3.0
2015-05-06T16:30:07.357Z
What is a splined move? ;-) (Possibly - how do I tell?)
Ben
CC BY-SA 3.0
2015-05-06T17:11:47.820Z
I can't give you the AE settings but when you have two position keyframes you can choose to move between them linearly or with a curve / easing / spline to smooth the motion. Sometimes even when the positions are the same, the tension of the spline results in a bump.
Jim Mack
<after-effects>
Ghost position keyframes in After Effects
Ben
# Ghost position keyframes in After Effects

(Asked by: username_0 on 2015-05-06)

I have an animation in After Effects where I am animating a slider to move up and down at certain points. The slider should be mainly stationary, but moves occasionally in line with other actions on the project.

![enter image description here](https://i.sstatic.net/sK56t.png)

What I am finding though, is the slider is moving a small amount even when the keyframes are set such that it should be static. E.g. the following two keyframes are the same (Y position = 524.6) but if I move the marker in between, you'll see the value deviates from this. (As a result the slider moves.)

1st Keyframe (Y Position = 524.6):
![1st Keyframe](https://i.sstatic.net/yZrVb.png)

2nd Keyframe (Y Position = 524.6):
![2nd Keyframe](https://i.sstatic.net/5EJFt.png)

In between (Y position varies, up to 525.4):
![In between](https://i.sstatic.net/ihVtB.png)

This is driving me nuts! As far as I can see the anchor point does not move, so I don't understand why this should happen.

**Tags:** after-effects

> **Comments:**
> **username_1**: Do you have a splined move between the keyframes?  
> **username_0**: What is a splined move? ;-) (Possibly - how do I tell?)  
> **username_1**: I can't give you the AE settings but when you have two position keyframes you can choose to move between them linearly or with a curve / easing / spline to smooth the motion. Sometimes even when the positions are the same, the tension of the spline results in a bump.  

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## 1 answers

### Answer by username_2 on 2015-05-07. Score: 2 | Accepted answer

It's because of spatial interpolation. Here's a previous answer:

[Object moving to a position I didn't specify](https://video.stackexchange.com/questions/14687/object-moving-to-a-position-i-didnt-specify/14697#14697)


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