Some type of weird reflection when going into the "Water"?

Hey guys, before writing a roman again (which got deleted due to connection issues), ill describe it quick.

  • I created a Water Surface with Shape_Plane, and also put a post process volume box under it, like in a tutorial video.
  • Every time I go into this Water, i get this weird reflection as shown in the picture in attachments…
  • My guess is, its some type of shadow but im not really sure how to fix it, or what is actually is, could someone help :DD

Ok I solved it, the Refraction Value had to be on 1, instead of 0,2