DFB XP rates broken on Everlasting?

[gameboy1234]

I think I ran into a bug last night on Everlasting.  Did a DFB with (iirc) seven people, and the leader was around level 12.  I was level 5 going in, or level 4.9.   After the mission was complete, I was barely level 6, like about 6.1.  This doesn't seem like enough / normal XP for a DFB mission at level 5.  Bug or did DFB get a nerf?

[gameboy1234]

Still the same issue: started DFB with leader who was level 1.  I was about level 6.9.  Got Double XP boost and still only gained 3 levels, final level about 9.5.  Feels way less than it used to be, and less than originally intended.