YOAST WorsPress SEO big sitemap problem

I am using WordPress SEO since 6 mounth now and I absulutly love it.
However since a few days I am having trouble with my sitemap.
Everthing lookes great however the sitemap https://www.joloshop.de/stores-sitemap.xml within the main sitemap https://www.joloshop.de/sitemap_index.xml does onlxy show 25 items however there are supposed to be about 485 entrys!!

Please, i need help, i switched SEO on/off i activated and deactivated sitemap still it only shows 25 items!