Sitemap doesn't include all images from NextGEN Gallery

Hi Everyone,

I use:
Wordpress 3.8.1
WordPress SEO 1.5.2.2
NextGEN Gallery 2.0.58

I have a little trouble with my sitemap.
https://yana-butenko.com/blog-type-sitemap.xml

It doesn’t include all images from NextGEN Gallery which added to post. For adding images to my posts I use “NextGEN Basic SinglePic” and “NextGEN Basic Thumbnails”. As a result, my sitemap includes all SinglePics and all preview SinglePics, also it includes my post’s miniatures.
But the sitemap doesn’t include all images added through NextGEN Basic Thumbnails.
For example, if you’ll see string:
https://yana-butenko.com/blogs/workshop-effective-job-search
in my sitemap, you’ll can see that post has 3 images. Here is code:

<url>
	<loc>https://yana-butenko.com/blogs/workshop-effective-job-search</loc>
	<lastmod>2014-03-03T08:07:55+00:00</lastmod>
	<changefreq>weekly</changefreq>
	<priority>0.6</priority>
	<image:image>
	<image:loc>https://yana-butenko.com/images/ngg_featured/00_20140228.jpg</image:loc>
	<image:caption>00 20140228</image:caption>
	</image:image>
	<image:image>
	<image:loc>https://yana-butenko.com/nextgen-attach_to_post/preview/id--2699</image:loc>
	</image:image>
	<image:image>
	<image:loc>https://yana-butenko.com/images/gallery/blog20140228/01_business_coach_gleb_dunaevsky.jpg</image:loc>
	<image:title>blog20140228</image:title>
	<image:caption>Business coach for establish business contacts and mentoring Gleb Dunaevsky</image:caption>
	</image:image>
</url>

There are 10 images in this post really.

Help me, please. How can I add images which added through NextGEN Basic Thumbnails to my sitemap?

Thanks…

https://www.ads-software.com/plugins/wordpress-seo/