Hello

Please add below code in your additional css area, this code show actual size of your image.

.entry-content .thumbnail-post img {
width: auto;
}

Thank you

Hello

Can you please send us screenshot and page url so we can check issue.

Thank you

Hello

Please follow this steps: http://prntscr.com/japzjy
Result of this: http://prntscr.com/japzzo

Thank you

Hello

Thanks for login details.
We test issue as you describe.
With my login details I cant access plugins page, so I cant check it with disable other plugins.
Please give me access of plugin page or you can try with one by one plugin disable and check when issue generate.

Thank you