Github API /issues - pagination trouble

Github API /issues - pagination trouble

I am using curl from a bash command line to GET Github issues like this:
curl -o myoutput --user "myuser:mypasswd" -G
https://api.github.com/issues?filter=all
This is working fine and returns 52 open issues.
I know there are more issues, so I am also examining the headers (using
-i) which provides links to the next & last pages,
https://api.github.com/issues?filter=all&page=2 &
https://api.github.com/issues?filter=all&page=14 respectively
However, using curl with these link URI's produces the same 52 results as
before. In fact any page number I try returns the same most recent issues.
I am deleting myoutput each time.
What am I missing?
Any words of wisdom on this would be much appreciated.
Thanks