Act 4 path completion and exploration issue.
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Many quests in the last 2 chapters in act 4 are bugged. Completed paths are showing to be incomplete. All my time and energy wasted. Look closely at this image... 
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Comments
Looks like you are coming back to explore more of Act-4 long after you had done some initial paths (but did NOT do it 100%)
Paths that were revamped/etc may have partial segments still marked a complete from before, while those changed/merged sections would be “not complete”.
Only if you were previously at 100% for an Act would it still remain as 100%. Otherwise it is subject to the revamp (and in general, very favorable changes for players).