Hey Michele,
line 146 of the “recent-posts-slider.php” file I’ve mentioned above says:
$img_details = wp_get_attachment_image_src( get_post_thumbnail_id( $val_p['post_ID'] ), 'full' );
which implies that the image being taken is the full version of the image. Could you please describe which amendments you’ve made to the “recent-posts-slider.php” file and how you added the post image that currently seems pixelated? Thanks!
Sincerely,
Andrii / Satori Studio