Tweet button count not updating


The count isn’t updating on my tweet button (I’ve given it over an hour, cleared the cache, etc). I’m using the standard code available from
to be specific, the code is

When the tweet button is clicked, the pop-up appears and is prefilled with what the above code produces. No worries. The tweet appears in my timeline ok.
But the count doesn’t update.
Here’s the url I’m talking about:
(Other pages on the same site use a slightly different official code version - that too wasn’t working on every page, hence my trying the new, default set-up as quoted in the code above)