Okay, so I ran two delves this morning, the first an 11, no loss of any lives, collected full rewards. While I did complete that part of the belt upgrade for collecting the 4 flawed titan directives, I did not get credit for completing the delve.
So I ran a “1” killing everything in the delve, killed the boss, no lives lost, collected my rewards and STILL did not get credit for “Complete an Overcharged Delve”. What am I missing?
were the delves you did actually overcharged that day? just doing one of the 6 if they arent actually overcharged doesnt count. if that isnt the case maybe you were raid grouped? im just throwing possiblities
The delve needs to be Overcharged, you likely ran a normal bountiful delve.
Exactly what I was going to say.
Oh crap. Why did I think those were overcharged rofl. How quickly can I delete this thread?
Look for the.ones with lightning on the map icon. They will also tell you on the window when you pick the tier level. 
Never! Your embarassment will be here FOR EVER!! Bwahahaha!
Good luck on your overcharged delve runs. May your drops always be an upgrade.
I just ran into this issue myself. The delve I ran was & still is an overcharged one. I am trying to get my belt on my DH, downed the 4 pylons in the quest but it still says I need to complete an OC Delve. It has not reset, so what gives?
Best guess is that there is an overcharged dude that you have to kill too. He’s large and often to the side, he spins I think. But I’m just guessing for you.
The first one had to be overcharged or it wouldn’t have dropped the Flawed Titan Directives and he said he got those.
I’ve found that sometimes, a delve isn’t properly flagged as overcharged when you enter. It’ll still have all the overcharged stuff inside, but your console talents won’t be active and (if you’re still collecting them) no shards will drop to unlock new talents. I imagine that if this occurs, it likewise won’t count as completing an overcharged delve for any quests.
Leaving and re-entering fixes the bug for me.