Images on Stellar Wordpress Theme being stretched vertically

Images on my website, particularly my home page, are being stretched vertically. Can anyone help with providing code and where to embed it to correct this? Here is my website:

Try clearing your cache - if that does not work then ask the author (It looks fine to us)

I’m surprised it looks nice to you. If you try loading on a cell phone, you should be able to see what I mean. If you load it on a desktop, just narrow down the size of your browser and you’ll see what I mean on a desktop too. Thoughts?

It’s likely just CSS but definitely a question for the author Support for Stellar | Photography WordPress | ThemeForest

Found the solution. Added this to CSS:

#supersized img{object-fit:cover !important; top:0 !important;}

Thanks for your efforts to help!