If close the lightbox-window not with "x" but somehow clicks into the screen, the background still overlaid with transparent background. The problem is that the modal generated by Joomshoping creates 2 modal-backdrop for that reason is that clicking on the space outside the modal only removes 1 and the other remains.
Joomshoping should create only one modal-backdrop, not 2. Can you change it please? I´ll send you test-link in PM.