I’ve noticed that the blob shadow prefab can result in lots of “light ripples” across the geometry in my scene. I assume that this is a consequence of their creating “shadows” by adding a (gobo) light to the scene. More lights moving around means more opportunities for light-artifacts, it would seem.
Your pixel light count is probably to low and thing are going back to being vertex lit instead of pixel lie. Either force pixel or turn up the pixel lihgt count. That should solve it.