"log list" console command outputs log categories - a licensee reported they see duplicated category entries in 4.13. (e.g. logFileCache, logHMD, logHUD)
Actually 4.11 and 4.12 had duplicated entries as well, but it seems in 4.13, especially logHMD, makes the duplication more apparent.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-37507 in the post.