Tile ScaleType creating a blue line at the top of the image?

I have an image that is 800x307 in size. I have set the ImageLabel to Tile. SliceScale 1 and Tile{0, 800, 0, 307} however I get this blue line at the top of the image, even tho in the original image I uploaded it is completely transparent at the top. When using other ScaleType’s there is not blue line, so it’s only in Tile