Hi there,
Scrolling markings (preset_7scroll.jpg) scroll wherever there is transparency on the body part (eg. preset_7body.jpg). Exporting things as a jpg gets rid of this transparency, and instead you need to export the body part as a png as this file type supports transparency. If you are using gimp to make your preset, you need to uncheck the box that says "save colour values for each pixel" so that the transparent areas remain transparent. I think that the scrolling texture has to be a png too. remember to modify the material file so that it says .png instead of .jpg, once you have re-exported everything in your preset to this file type.
Is your whole preset (eg mane, body, eye, tail, etc) supposed to have a scrolling component? Or just a certain part?