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Check your other plugins for conflicts. Such as do you have an SEO plugin? What is the url of the pages in question? Is the theme changing the way the title is used. There are many things that can affect the use of the meta title. If that is what you are asking about and not the wp title. You might also check the permalinks settings.

When moving content to a new site, I feel it is important to move as much as you can and leave little behind if you want all your pages to rank the same. The problem with moving pages and content is all the INTERNAL links, title tags, etc that make the website rank. It is much easier to delete pages after the whole website is moved. It very hard to put back all the Internal links and title tags. Yet these elements are critical to how people navigate your site and how google looks at the way you have supported the information on your website by linking to additional internal content relative to any particular page. In most cases if a website is ranking for multiple keywords in their business niche deleting any of the old pages, is just not necessary and may be harmful, until that page becomes a 'problem' to ranking, bad links to it, or simply not indexed anymore. Remember it is a counting game for most Internal links. So having 50 old pages linking to a new upper level and visible page, you want to rank, is very helpful. Even if the content is not something you want visitors to find, it is easy to leave the old content out of direct navigation on the new site so the only people that see it are from searches anyway and will be a small number of people. Everyone wants only high ranking pages, optimized to rank for particular keywords but that is rarely what happens. And google knows this, so having a mixture of poor pages and great pages actually will keep you from any negative points with google.

If you click on the cache, that is what google is using to index the page. You can also check Google Webmaster Tools, Fetch as Google tool, to see if your title is being picked up correctly. You can also see the frequency that google visits your site as well in Webmaster Tools.

I have had problems with Wordpress sites not being structured correctly and google pulling the wrong meta title.

Check your other plugins for conflicts. Such as do you have an SEO plugin? What is the url of the pages in question? Is the theme changing the way the title is used. There are many things that can affect the use of the meta title. If that is what you are asking about and not the wp title. You might also check the permalinks settings.