You can fix the issue by editing your template (Blogger -> Themes -> Edit html). Before you edit the template, make sure to backup your template and copy your custom CSS (Blogger -> Theme -> Customise -> Advanced -> Add CSS) to notepad. There is a bug in blogger that will reset your custom CSS whenever you edit your template. I have reported to Google.
Find the following text from Theme source code
Code: Select all
<title><data:blog.pageTitle/></title>
Code: Select all
<b:if cond='data:blog.pageType == "index"'>
<title><data:blog.pageTitle/></title>
<b:else/>
<b:if cond='data:blog.pageType == "archive"'>
<title><data:blog.pageName/></title>
<b:else/>
<title><data:blog.pageName/> - <data:blog.title/></title>
</b:if>
</b:if>
<meta content='summary_large_image' name='twitter:card'/>