No graphs for IPv6

[JG]

Hello

I have deployed AS Stats, everything works perfectly well but my IPv6 graphs remain at 0.

Here is the Netflow configuration on my equipments : 

  flow exporter-map FEM

   version v9

   !

   transport udp 9000

   destination 10.10.10.109 vrf default

   source BE144.10

  flow monitor-map IPV4-FMM

   record ipv4

   exporter FEM

   cache entries 16384

   cache timeout active 300

  !

  flow monitor-map IPV6-FMM

   record ipv6

   exporter FEM

   cache entries 16384

   cache timeout active 300

  !

  sampler-map SM

   random 1 out-of 2048

  router bgp 1234

    address-family ipv4 unicast

     bgp attribute-download

    address-family ipv6 unicast

     bgp attribute-download

Here is the configuration on the ports of my IP transit provider : 

 flow ipv4 monitor IPV4-FMM sampler SM ingress

 flow ipv4 monitor IPV4-FMM sampler SM egress

 flow ipv6 monitor IPV6-FMM sampler SM ingress

 flow ipv6 monitor IPV6-FMM sampler SM egress

Do you have any suggestions for me?