Enable step ticker option not working?

I have unchecked “Enable step ticker”, but the up/down steps arrows are still showing and working.
Is that an known issue?
Also note that I have 3 warnings as soon as I turn on product open pricing:

Warning: Cannot modify header information - headers already sent by (output started at mysite.com/wp-includes/functions.php:6114) in mysite.com/wp-admin/includes/misc.php on line 1438
Warning: Cannot modify header information - headers already sent by (output started at mysite.com/wp-includes/functions.php:6114) in mysite.com/wp-includes/functions.php on line 7137
Warning: Cannot modify header information - headers already sent by (output started at mysite.com/wp-includes/functions.php:6114) in mysite.com/wp-admin/admin-header.php on line 9