Thanks for the response Marcos. But I've already installed ECS from scratch and the same issue is occurring. I've also marked my home network as such(see attached screenshot), but the same issue persists. Earlier versions of ESET never had this issue, so I believe this goes beyond my settings and rules.
As for contacting my local ESET distributor, I did that last week and I'm yet to hear back.
It seems something changed in between ECS releases and it's possible the developers don't know about this. Could you raise an issue and escalate because as far as I can tell, I'm not the only one suffering with this and all remedies don't seem to work.
Thanks.