Distorted Avatar on Single Category Page

Hi There

This ticket is in regard things4strings.com, somehow, it's not on the license drop-down above.

I have updated EasyBlog on T4S today and I noticed today (not sure it was that way earlier) that the category images are not square, in fact, it's distorted. I could not find where in the setting I could change that. Would you be able to guide me

Links to pages in question:
https://www.things4strings.com/blog/categories/faqs
https://www.things4strings.com/blog/categories/results
https://www.things4strings.com/blog/categories/news

Screen shots attached.

Thanks!
Denise