Folks have already mentioned possible reasons for the rich result not showing up in Google.
One thing which I personally noticed is that FAQ Rich Results show
up only for results showing on the first page. Though there is no such
mention I have come across in Google Guidelines.
Since "Google does not guarantee that your structured data will show up ...
The order of structured data properties can't effect rankings. This is because Google says structured data doesn't affect rankings at all.
For more information about how structured data actually affects SEO see: Is Schema.org structured data (in Microdata, JSON-LD, or RDFa) relevant for SEO?