All deployments are executed on one node. Why?

[0Tom2020]

Hello everyone, I have a cluster with 3 permanent agents nodes and an autoscaler of 0 - 5 nodes.

I currently have 34 of my own deployments running. Strangely enough, they are all running on the same agent node. There are currently 50 pods running on this node. On the other 2 constant nodes only 13 & 17.
Tonight two nodes were started via autoscaler although the two constant nodes are not utilized at all. Does anyone know why this is the case?

Definition of the agent nodes

  agent_nodepools = [
    {
      name        = "agent-fsn1",
      server_type = "cpx21",
      location    = "fsn1",
      labels      = [],
      taints      = [],
      count       = 1
      longhorn_volume_size = 50 # In GB
    },
    {
      name        = "agent-nbg1",
      server_type = "cx22",
      location    = "nbg1",
      labels      = [],
      taints      = [],
      count       = 1
      longhorn_volume_size = 50 # In GB
    },
    {
      name        = "agent-hel1",
      server_type = "cx22",
      location    = "hel1",
      labels      = [],
      taints      = [],
      count       = 1
      longhorn_volume_size = 50 # In GB
    },
  ]

  load_balancer_type     = "lb11"
  load_balancer_location = "fsn1"

  autoscaler_nodepools = [
   {
     name        = "autoscaled-agent"
     server_type = "cpx21"
     location    = "fsn1"
     min_nodes   = 0
     max_nodes   = 5
   }
  ]

Example Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: service
  namespace: prod
spec:
  replicas: 1
  selector:
    matchLabels:
      app: service
  template:
    metadata:
      labels:
        app: service
    spec:
      containers:
      - name: service
        image: ...
        ports:
        - containerPort: 8080
      imagePullSecrets:
        - name: docker-nexus-credentials

My Nodes

Can anyone help me?