Hi @amletoguerra,
I experienced the same problem and it turned up kaltura-sphinx-config.sh set up both Sphinx servers with the same sphinxServer value in /opt/kaltura/app/configurations/sphinx/populate/populate.conf' and ini file there.
This leads to both Sphinxes using the same entry in kaltura_sphinx_log.sphinx_log_server in the MySQL database.
Just make sure each server has its own IP as sphinxServer value and reindex everything with kaltura-sphinx-reindex.sh
Waldemar