Web monitoring not updating results based on Update interval

[letom]

I had setup web monitoring for a url using the following trigger expression.

{mydomain.com:web.test.fail[my.domain].last()}<>0

Further a web scenario has been created with Update interval 60s , but I am unable to get the site status with in 60 seconds of time, as a site down/up is alerted with 10 minutes gap only, where the GET requests are reaching to the server every 10 minutes only. Its only get updated when GET requests reaches every 10 minutes as follows.

[12:45:46 -0500] "GET / HTTP/2" 200 98641 "-" "Zabbix"
[12:56:42 -0500] "GET / HTTP/2" 200 98641 "-" "Zabbix"
[13:07:39 -0500] "GET / HTTP/2" 200 98641 "-" "Zabbix"

Can anybody suggest how can I get status updated with in 5 or 3 minutes ? Where I am missing ?