I am using wp_nonce_url($url, 'my-nonce') and it is transforming my $url, with a couple of variables separated by &, into &

So, for instance, http:// www.domain.com/?var1=7&var2=12 becomes http:// www.domain.com/?var1=7&var2=12_&wpnonce=48ea26a9c3

In whatever way for this, because this makes var2 become amp;var2 when calling the $_GET?