thumbnails not posting to rss

Here’s the code I’m using. Any idea? Does the order of the items requested matter (i.e. author nice name first, custom post type, thumbnail last)?

What’s odd is on one custom post type the RSS feed is pulling in the image even though I didn’t specify it in the url.

Thanks in advance for your assistance.

/?call_custom_simple_rss=1&csrp_author_name=amb_jaclynlove&csrp_thumbnail_size=full&csrp_post_type=yogis_posts