How would one fix this seam on the sky sphere?

Hello, I have changed the original images inside the M_Sky_Panning_Clouds used as a texture by the engine provided sky sphere. I have made sure the images are the same sizes and have been accordingly warped for polar use (and the images are seamless), however I continuously am running into an issue, a glaring seam. My question is, does anyone know how to fix this? The Blueprint remains the same accept for the image changes, however I have attached an image anyway.

it looks like an issue with either masks, the normal, or the mesh as the base colour is seamless.

Hey thank you, you sparked an epiphany, I believe the issue may be in the texture coords

It’s difficult to see what’s going on there. Would be great if you can bless us with some more resolution on that screenshot!