попробуйте изменить ваш .htaccess с
# .htaccess for CMS made simple
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !/$
RewriteCond %{REQUEST_URI} !\.
RewriteCond %{REQUEST_METHOD} !POST$
RewriteRule ^(.*) %{REQUEST_URI}/ [NE,R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f [NC]
RewriteCond %{REQUEST_FILENAME} !-d [NC]
RewriteRule ^(.+)$ index.php?page=$1 [QSA]
# EOF
на
# .htaccess for CMS made simple
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !$ <--- to put the "/" ---->
RewriteCond %{REQUEST_URI} !\.
RewriteCond %{REQUEST_METHOD} !POST$
RewriteRule ^(.*) %{REQUEST_URI} [NE,R=301,L] <--- to put the "/" after } ---->
RewriteCond %{REQUEST_FILENAME} !-f [NC]
RewriteCond %{REQUEST_FILENAME} !-d [NC]
RewriteRule ^(.+)$ index.php?page=$1 [QSA]
# EOF
это работает для нас