Tweets created using the TWEET button on my web page are not appearing in the hashtag thread

[cbirckhe]

I am using the TWEET button on a web page. The Tweet appears to be send and will appear on my Twitter home page, yet it will not appear on the hashtag thread that I am targeting which is #CPA

Tweet

Yet if I manually create a tweet from the Twitter home page it works.

Can someone explain why these are not appearing from the website?

Thanks

[niall]