Many of this may be caused by EasyBlog. To remedy this situation from within the Joomla! backend under components select EasyBlog. Go to the Settings tab from within the component. By default you will be on the work flow menu. Choose the SEO tab. Here you will see some settings for meta data on the right.
You are given the option to automatically fill the meta description from the content of the blog (you can also do this for meta keywords although many do not bother with meta keywords these days). This sounds like a good option with less work for yourself and will create unique meta descriptions for each blog entry.
Alternatively you can edit the meta decriptions for each blog entry manually in two ways:
- Go into the Blogs tab and select and individual blog entry – on the right you can edit the meta description
- Or choose the Meta Tags tab – select and entry to edit the meta description