[Theme: Hatch] Featured images are very low quality

So I’ve figured out that for some reason the featured image is being cropped down to 316 wide, and then enlarged back to 640 width which is causing the low quality.

Unfortunately I have no idea why this is happening (and only with this post so far).

in your theme’s post.php file line#34:
<?php if ( current_theme_supports( 'get-the-image' ) ) get_the_image( array( 'meta_key' => 'Thumbnail', 'size' => 'single-thumbnail', 'link_to_post' => false, 'image_class' => 'featured', 'attachment' => false, 'width' => 640, 'height' => 360, 'default_image' => get_template_directory_uri() . '/images/single_image_placeholder.png' ) ); ?>

where it says: ‘size’ => ‘single-thumbnail’, try to use ‘size’ => ‘full’,
however this is a dirty workaround. The exact image size is set but I think it`s not defined as a mediasize. This way it grabs the fullsize image and downsizes it to ‘width’ => 640, ‘height’ => 360,