PhoenixFD 3DS Max waves look inverted?

[BStoneArch]

Hey all, I'm running into a strange issue where my waves start off nice, but then after keyframe 100 or so they start to look weird and inverted. Do any of you know what this issue could be? See screenshots below. The first is keyframe 50, the second is keyframe 200. There is a noticeable difference.

https://imgur.com/a/LHqLhqJ

[Svetlin.Nikolov]

Oh, off the top of my head, it looks to me like your grid resolution of 17 million voxels is far from enough to get this many small waves over such a large surface. You would need to go into the hundreds of millions. At least for the effect I imagine. Do you have a reference image, maybe it's not what I'm thinking and there is a another way...

Cheers!