mac masquerade expected behaviour with non floating self ip addresses.

Are you using traffic groups in v11.

If you have different physical interfaces, then I would think you need a traffic group per physical when you have mac masquerade enabled. Otherwise, one traffic group will be assigned to all the self IPs. As a result, the vlans and interfaces associated with that one single traffic group will have only 1 mac addressed advertised to the switch. So then interface 1.1 will appear to the switch as the same mac address as 1.4.