We have a very strange issue using Magento 18.104.22.168
After uploading an image using the image uploader both for CMS Pages and Product we see that the image size increase 3-times.
The image we are uploading in our disk is 100kb after uploading through magento file uploader it becomes 300kb
Even with images already loaded all of them have been increased. It's weird.
We can't figure out the problem since in magento backend there is no setting for the image quality or image compression.