Thumbnail images chopped off but not cropped to exact dimensions

In Media Settings I have Thumbnail sizes set to width and height of 150 and Crop thumbnail to exact dimensions (normally thumbnails are proportional) is not checked.

Since the checkbox is not checked, shouldn't the entire image be retained (since thumbnails are supposedly proportional)? However, it is not (see below). Why is this?

Topic media-settings media Wordpress

Category Web


Thanks to Tom's comments I better understand the issue. There are a number of solutions:

  • re-upload the image after applying new media settings
  • Regenerate the thumbnails with the "Regenerate Thumbnails" plugin or with wp-cli's wp media regenerate.

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