Help with star trail issue.

I was out for the second time shooting star trails or at least trying to. The first night was a bit windy so that didn't help. Last night I had better conditions to work with but not a lot of time.

I shot 45x exposures at 1min each, ISO 4000 @2.8 on a Samyang 14mm lens.

When I've uploaded them into photoshop to stack them I'm getting a very strange pattern appearing on the final image, the exact same thing is happening when I use StarStaX

Im shooting with a canon 1DX Mark II.

Any Ideas, almost looks like I've taken a camera phone photo of my desktop screen.

IMAGE LINK: https://flic.kr/p/2hPc​cdZ

The "Moire" pattern you are seeing, does it go away when viewed at 100%?

No it does not. But I think it’s to do with adding lens corrections before stacking so I’ll try that first.

Wow , don’t think I’ve ever seen that before and it’s bad ! Have you enlarged the images on your camera screen to see if this exist in the images on the camera ? Have you used the program called Registax to see if this happens in a different program??

Got the issue sorted, turns out its because I was using lens corrections on the images before stacking them, even though the tutorial I watched showed him doing exactly that and didn't result in him getting the strange patterns.

All sorted now.

IMAGE LINK: https://flic.kr/p/2hPD​fyy