Problem with special characters and nofollow parameter

Hello, I am using the plugin to redirect mysite.com/externalsite to externalsite.com/especialcharacters but the special characters are changing when I access the link and breaking it…

Like “~” is changing to “E”, “?” to “F”, “=” to “D” and at the end it is adding this “0BNED”

I looked at htaccess and they are respectively “%7E”, “%3F”, “%3D”,””.

What is wrong with it?

Here is the htaccess:

<Files .htaccess,.svn>
order allow,deny
deny from all
</Files>
Options +FollowSymlinks

<IfModule mod_rewrite.c>
RewriteCond %{THE_REQUEST} (.*)index\.(php|htm|html)\ HTTP/
RewriteRule ^(.*)index\.(php|html|htm)$ $1 [R=301,NC,L]

RewriteRule ^externalsite$ https://externalsite.com/%7Eaffiliat/cgi-bin/affiliates/clickthru.cgi%3Fid%3Dmyid [R=301,L]
</IfModule>

# End of Redirection

And how can I do to nofollow all the links redirected?

https://www.ads-software.com/plugins/redirection/