black images

Hi,

Recently I tried to change the scenes of my tour, however, since I changed the images sometimes some random scenes of the tour don’t appear (black background). When I navigate to this page through my phone the problem gets worse. Most of the scenes are completely black, also the quality of the images is really low.

I think is something related with the quality of the images format(size) and I need a minimum quality.

I actually need to solve this problem, it’s urgent.

Thank you

The page I need help with: [log in to see the link]