I figured it out. I had to pass the image in as an ID rather than a URL.
<?php
$image_id = get_field('content_image_1');
$image_size="home-left-column-block";
$image_array = wp_get_attachment_image_src($image_id, $image_size);
$image_url = $image_array[0];
?>
<img src="https://wordpress.stackexchange.com/questions/220603/<?php echo $image_url; ?>" alt="<?php echo the_field('content_block_title_1'); ?>" height="420" width="630">
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