all sortable tables broken by ampersand

ever since upgrading to 4.6.4 all core and contributed modules depending on sortable tables from url like :

www.example.com/admin/logs/referrers?sort=asc&order=Last+visit

have been broken

When clicked and extra ampersand is introduced like this

www.example.com/admin/logs/referrers?sort=asc&order=Last+visit&order=Last visit

this is also true for contributed modules depending on this functionality eg.

http://example.com/xtracker?sort=asc&order=Last+Post

-->

http://hansside.dk/xtracker?sort=desc&order=Last+Post&order=Last%20Post