Weird space issue only in preview

Hello all, I have used two images with linear blend modes to make a seamless background design. The bottom image is on a dissolve feature to act as auto tab changing. In my document on the right, you cant see a random line appearing. I think the issue is with the bottom image. In preview you can see there looks to be a spacing issue as if I havent moved it up high enough. No matter what I try, I cant seem to figure it out. So far I have tried:

  • Moving images and changing layer hierarchy
  • Altering the gradient on both images / single image

Any help would be really appreciated, thank you. I am a beginner so please explain accordingly.

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