Improving on History (char specific hidden copy), is this a bug?

Ok this is driving me crazy. I am trying to get the “Fighting with Style: Valorous” achievement and I have 3/4 sub criteria done however the last one “Improving on History (char specific hidden copy)” is grayed out. But, if I search for the regular “Improving on History” achievement, I can see that I have it. And I also have confirmed that the specific character has completed the Balance of Power questline which gives you the improving on history achieve via the script /run print(C_QuestLog.IsQuestFlaggedCompleted(43533)) which shows true for me. So what is going on? Is this a bug, or is there a way to get this achieve? Thanks for any help.