How to fix the imported users treated as guests?? Please help

[Don.]

Hi,

I am having a problem after I imported the users.



This image here shows that users are treated as guests. Here is the proof that accounts exist:



I used recount tools on admin panel, I did rebuilt post cache, recount user posts, etc ... pretty much every recount function available. It did not change post count which means the system finds users' posts but the showthread.php does not find their account I guess ... Here is the proof that imported users can login:



And here is the proof that database's contain the userids and usernames:



I have browsed and read this forums and looked up on Google but could not get any information. I myself, have got good understanding of PHP and databases but still, it does not work for me. Any help will be greatly appreciated.

Thanks

Don.