Responsive?

I think you’ll want to make sure you’re uploading an image that is the same width/height as the area where the featured image is being displayed on the desktop version of your site. The image should scale down on mobile/tablets fine, but if the image is too small to begin with it might be stretched to fill the space, which will cause the distortion you’re seeing.
If resizing the image doesn’t fix the issue, send a link to a page where you’re experiencing the distortion and I’ll see if I can troubleshoot from there.
Thanks!

The image is actually larger than the space. I guess I need the proper aspect ratio. The site is on my localhost, so I cant share it. Thanks though, Ithink i can work this out.

Yes, the aspect ratio could be an issue too. I’ve found a quick tool that helps when trying to figure out what size you want to crop an image down to while maintaining a particular aspect ratio https://andrew.hedges.name/experiments/aspect_ratio/
Hope that helps. If you need anything else, please let me know.
Thanks!