Images showing as question mark on mobile after pressing the 'back button'

[Vrijspel]

When I open my webshop (www.vrijspelspeelgoed.nl) on my mobile Phone and then click on a product picture to open the detailed product page (for example in the populair product secton), I can still see every image on the webshop. When I press the back button on my mobile Phone, to return to the home page, all the images are replaced by a question mark image. This Also occurs when I select products from any category and then press the back button.

 

Is anyone familiar with this issue and do you know a solution for this?

 

Thank you