Pathauto not working
There might be some problem with redirects. To overcome this problem, follow below steps:

Go to URL: admin/config/search/path/delete_bulk

Select option to delete all aliases.

Go to URL : admin/config/search/path

See if there are no aliases left, if any left delete them too. 

If you have redirect module installed, go to URL: admin/config/search/redirect and delete all redirects if any.

Recreated all URL aliases, go to URL: admin/config/search/path/update_bulk and select desired URL aliases to be created.
See if problem is fixed. If you still have issues comment below.