Corner of image is weird

The warp effect simply repeats the edges of the preceding ray effect and quite generally of course such extreme distortions will almost inevitably produce artifacts when they run out of pixels to process. You may want to take a more subtle approach and also apply the usual fixes like repeating edges with Motion Tile, Repetile or Kaleida. Quite generally there's nothing wrong, you just need to change your approach to this.

Mylenium