KERES THEME problem with changing order of photos in any gallery

Hi, Can I ask if anyone is still using the Keres Theme? I am having problems with the changing the running order of the images in any gallery, using drag and drop system. It lets me pick up the image, but as soon as I try to pull it to a lower or higher order in the gallery, I get a big blue bar !! Any help you be grateful. I have tried to disable each plugin one at a time, but nothing changes this problem. I am running WordPress 5.3.2 .Many thanks.

Hi,

Contact with your purchase item author hope they will help you out from your issue.

Thanks!