Those 6 formations CSM does have? All from data slates. Not a single one is from a supplement that's been released yet.
Fallen Champions is the Cypher dataslate, Helcult, Mayhem Pack, and Murderpack are all from the Helbrute dataslate, Kranon's Helguard was released in Advent Calendar 2014 I believe, as was Kharn's Butcherhorde.
Not a BattleScribe bug, more of a missing feature :) When you copy something that has links to some thing else you better check that the copied links still point to the right location. Seems someone didn't do the checking and subsequent fixing :)