[SR-Users] DMQ_USRLOC sync CSEQ error

Hi There, I'm using dmq and dmq_usrloc between 2 kamailio(version 4.4.0) registrar servers. I'm registering 15000 subscribers with sipp and everything is ok, the registration address of record are shared between both registrar servers. The problem here is when I restart one of the registrar server and then the other registrar server starts synchronization to restarted server. The error that i see on this process is the following shown bellow: ERROR: dmq_usrloc [usrloc_sync.c:75]: add_contact(): Invalid cseq But all the contacts are synchronized, what can cause this error? and what is the impact on normal behavior of kamailio? Best regards -- José Seabra