Counter for follow button

[LowPricePetrol]

I need to use this button for a website (for a university project).
I used this link “https://dev.twitter.com/docs/follow-button” and put the code below in the website:

Follow @LowPricePetrol script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");

The problem is that the counter near the icon of “following” doesn’t work.
If I click on following, the window with the information is open and I can see for example that the account has 4 followers, but the counter says 2.
Why?How can I fix it?

[episod]

Follower counts are “eventually consistent” in that they don’t update in real time in every location they may surface. There can also be discrepancies in counts based on how they’re being counted – “frictionless follows” by users without explicit Twitter accounts may be counted in one representation and not the other for example.

[niall]