At Magnolia 4.4.x theme pop images was located in dms, but Magnolia 4.5.x has located those images in resources. Because we don't remove images from old location then after migration from 4.4.x we have those images presented at two locations:

dms:/templating-kit/themes/pop/img
reources:/templating-kit/themes/pop/img

Demo-project or Theme-pop module should remove images from dms.