Face this 7.2rc4 issue in 7.1.3 :
http://forum.mikrotik.com/t/v7-2rc4-is-released/156082/64
Edit :
Finally, RB5009 switch chip is simply not able to handle dst-address related ARP traffic, while CRS317 has more advanced switch features, and so properly handles it.
Thank you for the explanation MikroTik support !