Did you add the services.conf directive for that option?
# IRCDINITChanServ [OPTIONAL]
# Module: ircd_init
#
# If this option is enabled, ChanServ will join
# all registered channels on startup (except for
# suspended or forbidden channels).
# Comment this to disable it.
#
IRCDINITChanServ
# End of module: ircd_init