A. Change your .htaccess code to this in $DOCUMENT_ROOT/.htaccess:
DirectoryIndex index.php
RewriteEngine On
RewriteBase /
Options -indexes
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule (?!^tip(/.*|)$)^.*$ /index.php [L,NC]
B. Change your .htaccess code to this in $DOCUMENT_ROOT/tip/.htaccess:
DirectoryIndex index.php
RewriteEngine On
RewriteBase /tip
Options -indexes
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{QUERY_STRING} ^$
RewriteRule ^([^/]+)/?$ /tip/?id=$1 [L,QSA]