Image Size

Hi,

Having some issue with the thumbnail size to be shown.

https://buildchance.com/buildedu/en/blog/2017/05/12/degree-skill-certificate-better-mqa-vs-jpk-2/?elementor

I want to ensure all the featured image shown on the sidebar is the same as the one at the bottom. Not sure why the first two will appear like that. All images uploaded are the same size.2000 x 920.

I set it to 300 x 300.

Please let me know what I done wrong.