just for some clarification her is an example
without battlemods both is going nicely to the left one
With battlemods i get this split up
so the targetd chat windows did not change between running with or without battlemod.
battlemods is moving the messages to the wrong window
I understand. The issue you have is that battlemod uses two different types of log modes for the two messages you see in that screenshot.
The filters in game for selecting which log to post a message to is broken down into categories such as: say, tell, party, effects you resist and calls for help. When an addon posts a message to the chat log, the command takes two arguments: the message to log, and the mode in which to log it.
IIRC, one of the modes is 7 which is the same as a /tell, so that message will go to the log that has tells. The only way to fix it, is to move your chat filters around, but I'd assume that'd make it worse and not better.