Having problem with images not showing from /htdocs/image/data. Well image manager shows all of them but not for some.
For example payment images when customer is on checkout page.

Everything looks fine and was working but suddenly stopped.
I have tried to search similar issue but for all of them, image manager is also not showing any pictures. All product picutres are working just fine and no problem. Some type of images are not working correctly such as slider images, payment images, logo was not working(moved to another folder and was working just fine) and any new ones I upload.
Website: www.digitaltrade.eu, based on 1.5.6 opencart and pavo_metro theme which is customized a bit.
Looking forward to hear some helpful comments.
Kind Regards,
Kaur