Irregular thumbnail generation

Hi!

I’m using 1750×1000 on all articles of my blog but the tumbnail sometimes is generated in a “box” shape (which breaks the visual appealing)

Here is an example:
https://imgur.com/a/i5GMtF1

You can see it also on the web:
http://www.fuerzaatleta.com

I’ve tried literaly everything but all the images are equally created but get different shapes.

Thanks,
Juanma

Hi Calin, thank you for your attention on my issue!

I’ve tried disabling all my plugins but the theme ones and still had it. I did replace the image without the plugins and some other things with no luck too.

There is some other thing I can do?

Sidenote: I’ve applied a custom CSS to stretch the image and camouflage it while we’re finding a solution:

.td_module_11 .entry-thumb{
width: 324;
height: 185px;
}

Problem solved! Thank you very much