The problem has completely gone for me now, also tried the same on the desktop setup removing those files (noted above I can disregard trying to figure out which one it is and just exclude the idle.kf in _male - Thank you for the input).
Glad the topic helped a fair few people, seems like it is information that may have been known at one time but got lost along the way and the same files have carried forward in different iterations of Roberts male - I did quite a bit of searching before posting and could not find anything that matched. The only thing that gave me a clue was remembering from experimenting with animation sequences on old programs like Sculpt3D on the amiga, where the timing of one animation looping can have a knock on effect in transition to another animation.
And obviously Andalaybay's comparison Load Order was a big help to narrow down the source.
If Malonn pops in - Check out the fifth post in this topic mate, and Belanos follow up pointing out the culprit of those two files, if Room207 gets round to updating it will affect your hosted version of AMB BAIN on TESNexus too. Might be worth while in the meantime just adding a note for users that those idles can cause moon walking NPCs.
Edit: Better if I just post on the file page.
Edit2: If anyone is in contact with AlienSlof, could you give her a heads up and point at this topic - Considering she has exclusive permission to host Rob Male v5 on her own site, and maybe at Wolflore?