It also affects other Legacy titles, not just Living Legend. I lost my Prolific (Lvl 30) and Dedicated (lvl 20) titles but not the achievements.
I also combined 2 legacies from Master Dar'Nala and Dalborra to Harbinger with disastrous results! All the achievements which I had started but not completed that required xx/XX have all been bumped up with outrageous numbers like 6600/1000 and now they are all broken and not able to be Completed.
this ^^ need some info on exactly these problems