please check your config with my example config
Hp A series
Interface Bridge-aggregation 1
Interface gigabitethernet 1/0/1
Port link-aggregation group 1
Interface gigabitethernet 1/0/2
Port link-aggregation group 1
Cisco
interface Port-channel 1
interface GigabitEthernet 1/20
channel-group 1 mode on
interface GigabitEthernet 1/21
channel-group 1 mode on
and test
Cisco# show interface port-channel 1 etherchannel
<HP-A> display link-aggregation verbose