GTID different between nodes

Hi,

I've configure a Galera Cluster between two sites (Site 1 and 2)
First node of site 1 is a slave of the current production Master (Percona 5.5.14 with standard replication).

Behind each nodes of the second site I've 3 RO replica with GTID method.

My problem is that I have the same GTID between each nodes except the node 1 of site 1 - node who's replica of the Master production.
I can switch a RO replica between each nodes except with the first one on site 1 because when I switch to it I've an error like this:

Last_Error: Could not execute Write_rows_v1 event on table test.tes1; Duplicate entry '195001708' for key 'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000002, end_log_pos 40652604

Need help to understand what happen.

On each config file I have:

log_bin=binlog
binlog_format=ROW
log_slave_updates=on
wsrep_gtid_mode=on

Regards