Min Stars filter not working properly in zone route list

[Arzorth]

Hi, I'm making the query "Routes in Berdorf between 8a and 9a with more than 1 star" and this is the result: https://www.thecrag.com/en/climbing/luxembourg/berdorf/routes/with-stars/1/with-grade/FR:8a:9a/?sortby=grade,desc

It is not showing routes above 8a with 3 stars, if I remove the Min Stars filter I get the following: https://www.thecrag.com/en/climbing/luxembourg/berdorf/routes/with-grade/FR:8a:8c/?sortby=grade,desc

Regards!

José María