Edge of shape layer being cut off?

The Grow Bounds effect worked for me. Put the effect before everything else and up the pixels to something like 2000px.

I found a solution to something similar. I had a couple FX added to a shape layer, including Fast Box Blur. The Wiggle FX on an adjustment layer above was cutting off just that shape layer just before the edge of the comp. I fixed it by de-selecting Repeat Edge Pixels in only the Fast Box Blur.

You are showing us the echo settings for layer Red Stroke 3 and the keyframes for layer Red Stroke 2. We have no way of knowing what is going on with Red Stroke 2 or even if that layer is the problem. Solo the layer you are having problems with, select that layer, and press 'uu' so we can see exactly what is happening with that layer and we can probably help you figure out what is going on.  Unfortunately, your screenshots don't tell us anything useful.

Probably you are reaching the boundaries of the shape layer. Try to precompose your Shape layer and then apply the Echo effect over the precomposition.