Rewrite problem in Member Page

I have a promblem with member list
When you open http://url/forums/members/list/ and choose one letter , it shows me only the names that the username beggins with "S" (CAPITAL)
and not the names withw ''small'' ''s''....

the httacess is

Code:

Options +FollowSymLinks
RewriteEngine On
RewriteRule ^((urllist|sitemap).*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]
RewriteCond %{REQUEST_URI} !(admincp/|modcp/|cron|vbseo_sitemap)
RewriteRule ^((archive/)?(.*\.php(/.*)?))$ vbseo.php [L,QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !^(admincp|modcp|clientscript|cpstyles|images)/
RewriteRule ^(.+)$ vbseo.php [L,QSA]
ErrorDocument 404 /404.php

in the vbseocp/Member's Profile URLs,
i use the: members/[user_id]-[user_name]
and in the config_vbseo.php
define('VBSEO_REWRITE_MEMBER_MORECHARS', 0);

Can you please tell me how to fix this promblem ?

Thank you for your time ,

I can't reprdouce this on my own site. I get both letter cases.

Does it work correctly with vbseo temporarily disabled?

i triyed and it doesnt work

In this case, it's likely not a vBSEO issue then.

Do you have any other modifications? i would try disabling them 1 at a time and seeing if it fixes the problem. If not, consult vB for support.

ok
Thank you for your time Brian