Flowgraph looks ok to me. One possibility is if terrain where grunts are spawned is bumpy, and grunts are spawning below terrain.

As you suggested, sometimes rebuilding the flowgraph can help if nothing else fails...

Thank you very much for your FG and for your help and support. I create the FG again and its working. I dont how it is when you copy often Nodes?! Last time i did this. Now i dont copy and paste. I create each node.
And when i add a new library for archetypes this time i named the group of it too. So perhaps it this was the failure.
Again, thank you very much!

Oh great

Copying nodes and creating archetypes without group should be ok, but main thing is issue got solved