Steps to reproduce the issue

Users->Manage->New Create new user (eg user1)
Components->Contacts-> Create contact for the new user
Content->Articles->Options Check "Show Author" and "Link Author"
Create article with this user
Go to frontend, on user1 article and click on Author Link "user1"
Now see the contact form url

Expected result

Link without ?Itemid=101
index.php/component/contact/contact/2

Actual result

You will see index.php/component/contact/contact/2-user1?Itemid=101

System information (as much as possible)

Database Version 5.7.14
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 7.0.10
Web Server Apache/2.4.23 (Win64) PHP/7.0.10
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 3.7.0-dev Development [ Noether ] 18-October-2016 16:37 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT

Additional comments