Newton 3, my shape keep going upwards why is doing its animation.

[mamas5DCB]

I've created a loop animation for a shape to move up and down, but when I use Newton 3, the shape correctly performs the animation yet continuously moves upwards, deviating from its initial position as shown in the video. What am I doing wrong? 

[Rick Gerard]

To figure out what is wrong, select the problem layer, press the U key twice to reveal all modified properties on the layer, and then examine the things that have been animated. Your movie shows no animation and no modified properties. 

The problem could be anything from a fouled-up setting in Netton to a loopOut ("continue") expression.

[mamas5DCB]

Thank you for your response. please see the first reply in this post to see the animation.

The "problem" layer only have tow keyframes from "x" position to "y" position and then a loopOut() expression.

[mamas5DCB]

this is the expression and the only keyframes in the layer

[Rick Gerard]

What property? I still don't have any idea how the project is animated.

[mamas5DCB]

sorry for the confusion. i attach a video showing the animation in this reply. 

This is the path my layer is following in loop.