I had the same problem, it happened because of PHP 5.6 and 7.x differences
I open Cpanel, “MultiPhp Manager”, choose the partition, change the PHP version 7.0 as 5.6, apply, then when i login to admin panel again i deleted that plugin. and turn into 7.0 PHP in Cpanel
Dear Joy, thank you for the answer, but i think you missunderstood something. I didnt expect wordpress delete unused images. Here is the screen shot of Cpanel
https://eustamp.net/dosyalar/wpress.jpg
Green line is original photo..
The red ones are cropped versions of the SAME photo.
This is killing server storage and disk space.
What must it be, is,
1 original photo such as: header.jpg
1 croped version such as : headercrop.jpg
the whole next crops must be overwrite on the 2nd one, headercrop.jpg.
If we want to use the same photo in different pages in difdrent size, then we must save as different name.
And, you told that this problem is because of Theme..
So i wont use that theme and this problem will be solved.
I suppose this is WordPress issue.
Thank you..
