Sitemap Issues

Hello

I’m running Yoast SEO on my site, http://www.buuy.uk and I’m wanting to submit the sitemap to Google to pick up, however when I’ve gone to the XML Sitemap page, there are 12 sitemaps :

http://www.buuy.uk/post-sitemap.xml 2016-03-04 11:16
http://www.buuy.uk/page-sitemap.xml 2016-03-15 09:17
http://www.buuy.uk/attachment-sitemap.xml 2016-03-15 13:37
http://www.buuy.uk/product-sitemap.xml 2016-03-15 13:37
http://www.buuy.uk/category-sitemap.xml 2016-03-04 11:16
http://www.buuy.uk/product_cat-sitemap.xml 2016-03-15 13:37
http://www.buuy.uk/product_tag-sitemap1.xml 2016-03-15 13:27
http://www.buuy.uk/product_tag-sitemap2.xml 2016-03-14 11:38
http://www.buuy.uk/product_tag-sitemap3.xml 2016-03-15 13:37
http://www.buuy.uk/product_tag-sitemap4.xml 2016-03-14 11:38
http://www.buuy.uk/product_tag-sitemap5.xml 2016-03-15 13:37
http://www.buuy.uk/product_shipping_class-sitemap.xml 2016-03-15 13:37

It seems that Yoast SEO is still somehow collecting information from when my site was a fair size, i.e. I had over 100k products listed on the site. Now, its not even 200 and a completlely new site etc..

Most of the links above contain 1000+ URL’s..

How do I get Yoast to do a clean up and only create a fresh new map for Google??

Many thanks

-Justin / UK

https://wordpress.org/plugins/wordpress-seo/