For the query above, update it so the app="easyblog" . That will fix the EasyBlog entries with the extra {actor} tag as well.
For the account linking issue, please look in the JLinked -> Usermap area and see what connections have been made between your Joomla users and LinkedIn. Mainly, check the Joomla user that is 'wrong' and see if there is any LinkedIn mapping vs the 'right' Joomla user. The LinkedIn ID is a unique value that isn't super helpful, but it may help determine which accounts are mapped and what may be wrong.
Finally, can you let me know:
* Have you modified anything in JLinked? If so, what? That may be part of the problem.
* Do you have any caching enabled on your site? Caching shouldn't be a problem, but try with it disabled and see if that prevents the problems.
I hope that helps narrow things down,
Alex