WooCommerce "Thumbnail Crop" Issues

When I choose the option “1:1” or “No cropping” and save the changes with the “Publish” button, these changes are not saved. I refresh the page and the “Custom” option is left with the values “141:181” (values that I never entered).
When I choose “1:1”, in the preview (on the right side) it looks perfect (second image). But then when I save these changes, they are not saved.
It seems to be as if those values were forced by the theme or something similar, since I never touched anything on that.
What I need is for the thumbnails to be square.


You need to enable this option first http://prntscr.com/umcfy7