Enable the Hard Crop to allow for narrow images
When you add an image that is too narrow, so 190x 900, it doesn't crop it. So the image causes bad tiling on most Themes.
In theory, it should 'not' crop the width, but should crop the height for thumbnails. But it doesn't.
There are plugins can that 'add space' around the image, to fit, but then you would just get 'a line' that in the tile.
Be good if the Crop could spot this...