Then they probably are connected, but dislike Pi-hole's blocking.
You could inspect Pi-hole's Query Log to learn which domains a specific client IP has requested and how Pi-hole processed them, e.g. by clicking on such a client as shown in Pi-hole's dashboard under Top Clients.
How do I determine what domain an ad is coming from? may also help.
That's expected - you are misunderstanding what that nslookup does.
You are asking 192.168.1.229 for DNS resolution, but there is no DNS server on 192.168.1.229.