Posible error en htacces caida del posicion?

RewriteEngine on
RewriteCond %{HTTPS} !=on
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
RewriteCond %{HTTP_HOST} ^www.midominio.com [NC]
RewriteRule ^(.*)$ https://midominio.com/$1 [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.html [NC,L]

AddDefaultCharset UTF-8

<IfModule mod_expires.c> 
  ExpiresActive On 
  ExpiresDefault "access plus 600 seconds" 
  ExpiresByType image/x-icon "access plus 604800 seconds" 
  ExpiresByType image/jpg "access plus 604800 seconds" 
  ExpiresByType image/jpeg "access plus 604800 seconds" 
  ExpiresByType image/png "access plus 604800 seconds" 
  ExpiresByType image/gif "access plus 604800 seconds" 
  ExpiresByType text/css "access plus 604800 seconds" 
  ExpiresByType text/javascript "access plus 604800 seconds" 
  ExpiresByType application/x-javascript "access plus 604800 seconds" 
  ExpiresByType text/html "access plus 7200 seconds" 
  ExpiresByType application/xhtml+xml "access plus 7200 seconds" 
</IfModule> 

<IfModule mod_headers.c> 
  <FilesMatch "\\.(ico|jpeg|jpg|png|gif|swf|css|js)$"> 
    Header set Cache-Control "max-age=604800, public" 
  </FilesMatch> 
  <FilesMatch "\\.(x?html?|php)$"> 
    Header set Cache-Control "max-age=7200, private, must-revalidate" 
  </FilesMatch> 
</IfModule>

<filesMatch ".(css|jpg|jpeg|png|gif|js|ico)$">
Header set Cache-Control "max-age=2592000, public"
</filesMatch>
	
<IfModule mod_deflate.c>
    <filesMatch "\.(js|css|html|php)$">
        SetOutputFilter DEFLATE
    </filesMatch>
</IfModule>
ErrorDocument 404 https://midominio.com