Lotus Flowers and Snakes - Painting For Pattern Design 2

I completed the pattern and uploaded a few colorways to Spoonflower. Now I can't wait to begin my next one.
I have digitized my pattern tile by following Catherine's method and adapting it to my circumstances. I used generative fill to fill in the line of pixels in the seams. I had lost some of the painting because the page is a few mm longer than the platen on the scanner.
So, I have reached the point of having a pattern tile that works in pattern preview mode but it has a seam around it and I don't know how to get rid of that. I am rewatching the classes and if anyone has any idea what is causing this, please tell me.
Also, I couldn't figure out how to make a half drop repeat with 4 panels.