Hi,
There is no ambiguity in the rytec.channels.xml:
<!-- 19.2E --><channel id="CanalPlusBoxOffice.fr">1:0:19:200D:430:1:C00000:0:0:0:</channel><!-- CANAL+BOX OFFICE -->
So your problem can come from your IPTV provider that include a conflicting EPG source with wrong service reference. You need to investigate locally on your STB, this is not a global problem according to me.
Pr2