Redirecting HTTP to HTTPS correctly

Question

Hello

I have searched in different places but I can't find a solution to the problem. 

In the Q2A dashboard I have set the URL structure as follow : 

/123/why-do-birds-sing (requires htaccess file)

and the .htaccess file is as follow: 

DirectoryIndex index.php

<IfModule mod_rewrite.c>

RewriteEngine On

RewriteBase /

RewriteCond %{REQUEST_URI} ^(.*)//(.*)$

RewriteRule . %1/%2 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^.*$ index.php?qa-rewrite=$0&%{QUERY_STRING} [L]

RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"'

RewriteRule ^(.*)$ https://MYDOMAIN.com/$1 [L,R=301]

</IfModule>

this will do a 301 redirect from HTTP to HTTPS. However, if the user enters an address like this : 

www.Mydomain.com/users 

They are redirected to : https://Mydomain.com/index.php?qa-rewrite=users which returns a 404 error page

 

I have been trying to resolve this issue for several days now and I can't 

thanks in advanced