Where is the "others" comes form?

Hi everyone,

I have a question about the “others”, first please refer this page which said after the top 500 or top 1000 rows, Piwik automatically groups pages.(https://piwik.org/faq/how-to/faq_54/)
but in my case( please check the image below), the row dosn’t reach 500 or 1000 at all,

what’s the difinition of the number(row or visite number)? which number reached 500 or 1000, Piwik automatically groups pages to others?
And if the number (rows or visitor number) reached 500, the “others” will be gone?

I will appreciate your kindly help.