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Instance getting two IP addresses

I'm loading a stack in HEAT and get a rather strange issue: some of my instances randomly get a double IPs on the network. I made a screenshot of the network topology but can't upload yet (not enough karma).

Simply, there is 2 IPs associated by the DHCP. It doesn't happen all the time and it's not linked to a particular network, instance, nor HOT template... The instance itself doesn't get 2 network interfaces and only one is correctly configured with an IP. So everything works normally except that I'm using too much IP in my DHCP pool.

Anyone having seen this behavior? Any way to fix this?

Some context:

  • OpenStack kilo
  • deployed with packstack with neutron
  • happened on 2 different OpenStack instances with different hardware.