VM NIC MODE TYPE default virtio but switch to rtl8139

Dear all,

version : OpenNebula 6.6.0 CE.

I have a surprising behavior since few days with my networks.
I have two networks one for public and one for private (ovs-bridge vxlan) on my cluster.
Since the beginning of the week, I’ve had a bad NIC type for the interface in my kvm machine.
The default in virtio in all conf file, but when I create a vm, the choosen interface by ONE is rtl8139.

My NIC part of the vmm_exec_kvm.conf

NIC = [
    MODEL = "virtio"
    # FILTER = "clean-traffic"

xml of the VM:q

 <interface type='bridge'>
      <mac address='02:00:ac:10:10:0a'/>
      <source bridge='ovs-br2'/>
      <virtualport type='openvswitch'>
        <parameters interfaceid='0dbb55b4-57e0-4dd2-8250-828547000a9e'/>
      <target dev='one-4-0'/>
      <model type='rtl8139'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    <interface type='bridge'>
      <mac address='02:00:c0:a8:70:cf'/>
      <source bridge='br2'/>
      <target dev='one-4-1'/>
      <model type='rtl8139'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>

Last week, virtio was used instead of rtl8139. The lonely thing that I did, is to use terraform to create my last vm.

Do you have any idea, why rtl8139 is used ?
Is it possible to check in the database if something overwrite the vmm config ?

Best regards