Silver search

I was looking for silver coins of Poland with search on numista catalog.

It gave me only a few.

Than I've changed it to search “precious" and that search gave me all of the silver coins but with gold and platinum also.

I don't understand why the silver items are not recognized in search for silver coins.

757 silver coins https://en.numista.com/catalogue/index.php?e=pologne&r=&st=147&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=1&f=&t=&t2=&w=&mt=&u=&g=&c=&wi=&sw=

How did you search?

Only standard circulating and commemorative circulating. I tried now again and now it works.

Maybe it is a bug that occurs only sometimes.

Hello,
If this happens again, please send the URL of your search page, so we can check further.

Sounds like a PEBCAK error