Hi, when you configure vrf forwarding on one subif and none on the other corresponding subif. Then this is bound to happen.
But this would not be a correct configuration, as the corresponding interfaces of a HSRP group either hsould be in global or VRF, but not simultaneously both.
As the one with vrf forwarding is acting in a VRF aware HSRP mode and it will refer to the VRF attached ARP table for any resoulutions and one with none is acting in global hsrp mode which will refer to the global arp table.
Hence each router thinks they are active in their own modes, and they are also able to send keepalives to each other on the directly connected link.
It was unthoughful of me to reply at the first though that ran across my mind.
Please ignore my previous post.
Actually even if you use one side with vrf and other without the vrf there wont be a Active-Active state.
There can be a active active state only if both the routers miss each other hellos for the configured hold time. And this can happen only if there was a instability between your switches as all the other interfaces were up when you shut one subinterface.
There is a bug as well which might create this but this is quite old, and might not be affecting your setup, but still take a look at this link.
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