Did you put a "\" at the end of the tagging rule in the Value Box?
If yes, what is your exact tagging rule? See my example below.
PS: Any tagging rule for the [filename (path)] tag is applied at the beginning of the recording, so that the recording is written to the correct directory from the start. So that wouldn't be the conflict at the end.
Most tagging rules are applied at the end of the recording, but path component of the [filename (path)] and [filename] tags are the exceptions, processed at the beginning so that the location of the recording is correct from the beginning of the recording. I think the Name portion of [filename (name)] and [filename] are also processed at the beginning, but my memory fails me. There is a thread or two discussing that somewhere.