[App_rpt] registering with 3 nodes?

My asterisk installation (ACID) is running with 3 nodes on it, and in my iax.conf, I have 3 register lines (one for each node), however when I look at rpt_extnodes on my node and a remote node, it seems like the last entry is getting updated with the correct IP, and the first 2 don't get updated at all. iax2 show registry shows that all 3 nodes are registered. Any ideas? Nodes in question are 2142, 2165 and 2191 - all on a single host. Jim / K6JWN