[Mahesh]

Hello Serkan,
First, I deactivated all the plugins, but the issue was still there.
Second, I regenerated the images using your suggested plugin and here what happened.
All the images became of same width and height but now all of them are cropped to the same size.
Earlier, the images which were fully visible are also cropped now.
Any other solution?

[Mahesh]

I tried it. Its working for desktop interface but not working for mobile interface.