Gallery group edit issue

Hello,
I create gallery group and insert some galleries. Then I want to edit the gallery group or add more galleries but when I click on the group it doesnt open, just refreshing wp.
I deleted the gallery, deleted all the images for it, I created new folder and subfolders, uploaded all the images again… But nothing changed. Sometimes I can edit once or twice the gallery group, then it becomes non responsive. I can unpublish or delete it, but cant edit it. Pls hlp

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