have a look to your nodes on your deployed cluster:
% kubectl --kubeconfig kubeconfig get nodes
my-exoscale-master-jg4dw Ready master 2m v1.12.5
my-exoscale-node-5sxj9 Ready <none> 1m v1.12.5
% kubectl --kubeconfig=kubeconfig \
delete machines.cluster.k8s.io \
my-exoscale-node-5sxj9
output
machine.cluster.k8s.io "my-exoscale-node-5sxj9" deleted
Follow the node deletation.
% kubectl --kubeconfig kubeconfig \
logs -f exoscale-provider-controllers-... \
-n exoscale-provider-system
% kubectl --kubeconfig kubeconfig get nodes
my-exoscale-master-jg4dw Ready master 3m v1.12.5