Blog post excerpt

Hey,
Please can you explain why the blog post is functioning like this.

On the home page please see the 1st blog post called “UK TEST REVIEW”

The blurb is:
The overall impression of Sebastian from the team was a positive one, particularly with regards to his wet weather ability and his translating the input from driver coach and…

However, the first line of text is:
It’s not often a South African driver gets the opportunity to prove his worth on an international level – but one such opportunity was afforded to karting champ Sebastian Lanzetti.

All the other posts use the first snippet of text?

How can I fix it or get it to display text I add to the “excerpt” box.