Joomla + OpenSEF problems

Hello,

I have a few sites on Joomla + OpenSEF working fine! But the oldest of them have serious problems related to OpenSEF:

It seems that it is generating lots of sorting queries! When i run "mysqladmin pr" command i see the following result:

| 5776 | levent_levent | localhost | levent_xx | Query   | 0    | Sorting result       | SELECT * FROM javatips_sef WHERE 1
AND (direction IS NULL OR direction = '' OR direction = 'o')
AND  |
| 5793 | levent_levent | localhost | levent_xx | Query   | 7    | Sorting result       | SELECT * FROM javatips_sef WHERE 1
AND (direction IS NULL OR direction = '' OR direction = 'o')
AND  |
| 5814 | levent_levent | localhost | levent_xx | Query   | 7    | Sorting result       | SELECT * FROM javatips_sef WHERE 1
AND (direction IS NULL OR direction = '' OR direction = 'o')

Code (markup):

Upgrading OpenSEF generated url-rewrite loop! Even if i removed entries from OpenSEF table and run a crawler to obtain the friendly urls from the start, it again generated url-rewrite loop which make my web server unresponsive.

Now, i am thinking to chaange my CMS by keeping friendly urls as much as i can. What do you suggest? What can be the problem?