FLIP tank with ocean, ocean plane doing something crazy at the edges

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I have a flattank fluid extended scene where the outer edges of the ocean plane are bending up about every 3rd rendered frame. See attached images. I am only a few months into Houdini, so I'm still new (excuses). Does anyone have any ideas as to what might cause this?

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Type055.0100.jpg (632.5 KB)
Type055.0101.jpg (809.0 KB)
Type055.0102.jpg (769.2 KB)

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Here is the particlefluidsurface node if this helps

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particlefluidsurface.jpg (320.8 KB)

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It appears that if you reduce the particlefluidsurface node “Region Voxel Scale” it fixes this issue. I had it set at 4. After reducing it to 1 the ocean plane flattened out.

Attached are a couple of images showing the ocean plane bent up and then flattened out.

I don't understand why that fixed this issue. I will have to do more reading through the docs. If anyone knows I would love to hear what you think.

Thanks.

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oceanPlaneIssue.jpg (929.8 KB)
oceanPlaneIssueFixed.jpg (901.3 KB)

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The above post is actually from me. I was logged into my work profile, oops.
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