FMC license doubled after adding a node for FMC HA

Just see something strange: I just added a fmc node to convert existing fmc to fmc HA, and then I see warning that fmc is out of compliance.

So before HA implementation, the fmc is managing 21 ftd devices, after HA implementation, the smart license manager in the web UI shows fmc is managing 42 devices...

Is this normal?