Order of photos inconsistent

I have a problem with making the order of the photos correct in a portfolio entry. That is the order is correct when viewed at the smartphone browser. But when viewed on the computer the order is correct only if you click on the first photo and then “swipe “. Otherwise when you look at the whole page with all the photos at once the order is random. I am using Post Type Order plugin but this seems to be applicable to the order of the Portfolio entries. Not to the order of photos within entry.