Copy the title Google is showing then go to your page, and view source, try , hit Ctrl+F and paste, then see if that appears in the source. If not it might be in your sitemap. Check that. Also there is often a seperate place to insert a Title in wordpress on the post page, and an option in the plugin to use the post title as the title tag, check those out.

It is also possible that that is an old tile and Google just hasn't updated it yet. You could fix this if this was the issue, and you are in a hurry for an update by going into Google Webmaster tools, deindexing it, then using Google fetch to reindex it, but I wouldn't do this myself,doing so might cause a decrease in traffic over the short term, besides Google will likely do it themselves sometime in the near future.

in my opinion, it would be good if Automattic added an SEO feature into the stock WordPress installation. This would help new users make their on-page SEO stronger. But for now, you can always use any of these SEO plugins to add an SEO meta title and SEO meta description.

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Please check under general settings of wordpress site title name

Two things:

1) If you changed it recently, it will take Google some time to index the new title. They do not fetch the title from your site in real time.

2) Google reserves the right to use whatever title they want. Sometimes they will change the title to something their algorithm feels better matches the user query.

What Mike said, plus, look at the Google cache because it shows you the HTML source code (<title>) when the cache bot last crawled your webpage.