Cannot ping floating IP and active side self IP from client

I've deployed 2 BIGIP VE(12.1.2.1.65.271 Engineering Hotfix HF1) without HA configuration with following IP address

floating IP: 172.21.61.254/24
active side self IP: 172.21.61.253/24
standby side self IP: 172.21.61.252/24

Here's the problem,

• All loadbalancing are functional, all 3 configured nodes(172.21.61.[11,12,13]) can ping all these self & floating IPs on BIGIP and client, which is not in this 172.21.61.0/24 range
• Client can ping VIP and these nodes, but ping to floating IP(172.21.61.254) and active side(172.21.61.253) self IP timeout, only standby side self IP(172.21.61.252) is pingable.
• I tried failover but still, only current standby self IP(this time 172.21.61.253) is pingable, other 2 IPs result in timeout.

Is it an expected behavior or am I missing some configurations?