Visiting this link in a browser does indeed load a page which seems to contain twitter:card metatags.
However:
$ curl -A Twitterbot http://www.reebonz.com.sg/the-perfect-bag-sg/index.html
<html><head><meta charset="utf-8"></head><body><script>window.rbzns = {fiftyeightkb: 43200000, days_in_week : 1};</script><script src="//d1a702rd0dylue.cloudfront.net/js/sugarman/v7/flat.js"></script><script>rbzns.challdomain="www.reebonz.com.sg"; rbzns.ctrbg="2NHsXd3FH7/bA596p2bqg0JHWVCytd6KWyI0LnXN8ISgfCbzfj+l8nPIMYzgQ80Vq2qFc2Exg9oWsSDG2kS34MjQ0lDLE5bTPckGcpyhYuIjPalS/61GuHg97EtLt+kKEq9uLqBhCA+EiVhwePW+5w==";rbzns.rbzreqid="5235ab9f3134333731323336393785c015db5b662406"; winsocks(true);</script></body></html>
I don’t know what redirect magic you are using here but your raw HTML with header and meta tags needs to be accessible for Twitterbot to crawl, and it doesn’t support Javascript. This is why your Cards are not working.
