The issue is that you have the ‘Exclude Replies’ setting enabled on your widget, so the most recent Tweet “@ChampionFreight has moved head office address” is being excluded, as it appears to be a reply to yourself.
That might well be a little bug on our side (since you Tweet mentions you, it doesn’t reference another status ID), so I’ll have someone investigate fixing it. Sorry about that, and thanks for letting us know about the issue.
You should find that any other Tweets (not with a username at the start) will display fine.