enterprise replication question

Hello, I have 4 servers. 1 + 2 -> setup hdr 3 -> central 4 -> upper level I defined a replication between 1-2 group and the central group. This replication works just fine. I also defined a replication between 3 and 4 . This replication also works fine. But when I insert a new record in 1-2, this is replicated to the central pc (3) but cannot be found in pc 4 (although the replication between 3 and 4 works perfect). It looks like when a change occurs in 3 that comes from the replication with (1-2) it isn't seen by the replication with 4. I also noticed another problem : when my primary server from hdr drops and the secondary takes over the work, and then the primary comes back. All the changes are written to the primary but are not sent to the central? Although these tables are in a replication. Is this normal ? Can anybody help me here ?? Thx in advance !!