Hi Jo
Change it to LOW overlap and run it from scratch 
LOW -> will try to use the whole image
MEDIUM -> medium…
HIGH -> only the “central” part of an image is used
These settings are here because it is not always good to use the whole image space because in most cases the “outer” part of images is of lower quality ( vignetting, blur, etc. ) that is why we use MEDIUM as the default… it is about experience to know when to set different settings as the default ones…