Slower routing of the DNS traffic

 when running a test on https://ping.nextdns.io I see there are many faster servers than the selected one, Is there a reason or a methodology behind that?

diag output: https://nextdns.io/diag/b3af0350-fa90-11ee-9da0-fb931d142611

  zepto-ist    11 ms  (anycast2, ultralow2)

  zepto-sof    20 ms

■ vultr-lon    57 ms  (anycast1)

  zepto-buh    75 ms

  edgeuno-ist   81 ms  (ultralow1)

  edis-kiv    90 ms

  anexia-ath    93 ms

  zepto-ath   101 ms

  anexia-buh   110 ms

  netshop-nic  114 ms

  anexia-sof   238 ms