Hey @Mario_Albo_Soria, welcome to discuss 
It seems that you are configuring both, a static input configuration with filebeat.inputs, and a dynamic one with autodiscover. If your kubelet is being executed as a docker container, and it contains kubelet on its name, the autodiscover configuration should be enough.
The filebeat.inputs configuration you have there is configured for all containers, could you try to remove it, and use only the configuration in autodiscover?