编辑：你能发送链接到那个页面，这样我就可以看到css了吗？

这有点像是在黑暗中拍摄的，因为我只添加了图像大小，但我相信您应该能够更改缩略图裁剪位置。图像src是否100%不正确，图像是否未被css切断？

function setup_image_sizes() {
    set_post_thumbnail_size( 50, 50, array(\'center\', \'center\') ); 
    //Or try
    update_option( \'thumbnail_crop\', array(\'center\', \'center\') );
    //I am assuming the image size is called thumbnail but it might be different if it is created in the plugin

}

add_action( \'after_setup_theme\', \'setup_image_sizes\' );