Unfortunately I can't see any meta title tag in the source of your mentioned blog post. The only title tag is normal title tag, which is sufficient for a page. Actually you have problem with your pages. There are two URL's for a single article, one for registered user and one for normal user (comes under duplicate content category). Even meta description for both URL is different. And the page which is indexed in Google search is the URL for non-registered user.

h1 tags have no effect on the title of your page. You can use this tag any number of time but it's recommended to have only one h1 tag on your page (can be your article heading). For sub-headings you can use h2 tag.

As we are aware of the importance of the page title in Google search results, due to a good, we can have higher click-throughs and more traffic in the site, while having a poorly crafted title results people to skip over the site.

So how does Google determine exactly what to use for the title of your page in search results? Is it affected by schema? Is this affected by certain headings (H1s or H2s)? Why won't Google just show your title tag?

Google changing title isn't new thing.

Google's Distinguished Engineer Cutts explained:- "Whenever we try to choose the title or decide which title to show in the search results, we are looking for a concise description of the page that's also relevant to the query, Google looks for three things: Something relatively short. A good description of the page and ideally the site that the page is on. That it's somehow relevant to the query. So if your existing HTML title fits those criteria, then often times the default will be to just use your title, So in an ideal world it will accurately describe the page and the site, it would be relevant to the query, and it would also be somewhat short. Not all webmasters write great titles for search engines though. Or sometimes you wonder why Google chose an odd or even completely inaccurate title for a webpage, when it isn't in the title tag or the page's title. here are the other ways Google picks a title for a page in their search results, Now if your current title, as best as we can tell, doesn't match that, then a user who types in something and doesn't see something related to their query or doesn't have a good idea about exactly what this page is going to be, is less likely to click on it. So in those kinds of cases we might dig a little bit deeper, We might use content on your page," he said. "We might look at the links that point to your page and incorporate some text from those links. We might even use the Open Directory Project to try to help figure out what a good title would be. We're looking for the best title that will help the user assess whether that's what they're looking for. How you can try and tailor your titles for those keywords you feel a searcher is going to search for. So if you want to control the title that's being shown, you can't completely control it, but you can try to anticipate what's a user going to type," Cutts said. "So make sure your title reflects not only something about that query or the page that you're on, but also includes the site you're on or tries to give some context to the user knows what they're going to get whenever the clicking on it."