I have an amp page at the following UNS and its already cached by Google. When this paged is served from Google's cache, its showing a 2 day old version of page.
Original AMP URL http://www.motachashma.com/amp/articles/ntse-result.php
URL from GOOGLE's Cache https://www.google.co.in/amp/www.motachashma.com/amp/articles/ntse-result.php
My response header has following for cache control, I was expecting that my page will be updated in cache after few minutes,but its already 2 days.
Response header Cache-Control:no-store
From my server logs I can see Googlebot is coming to this page every few minutes. I even tried the update PING URL from Google but that simply redirected me to my servers AMP URL.