Not all pages indexed

[Daria]

Hi, 

I have moved my sex shop https://zPieprzykiem.com to presta. For a while I was trying to position my page but even when I added all metatags, orginal description pages position was not influenced. IT occured that google didn't index them. Those pages are in the sitemap. In google search control it says that 3444 pages were send 2528 indexed but when I use site:zpieprzykiem.com it's showing 500-ish pages only. What is even more strange one day its 505 and the day after 477...

example of not indexed page: https://www.zpieprzykiem.com/pierscienie-erekcyjne/7959-pierscien-erekcyjny-mystim-his-ringness-earl-polerowany-48mm.html

I have no idea how to fix that.

I will be greatfull for any advice.