My experience is similar, but Herbal Entrepeneurs jumped straight to my completed list with the ! in front of it.
I'm playing on PC (edited)
My order of events (in case it helps for bug replication):
I triggered the Emergency S.O.S. quest while exploring, but did not follow up on it yet.
I found the Broken Family location.
I talked to everyone except the salarian.
The asari gave me the quest to fix the antenna, which I did.
After completing the Broken Family quest, I talked to the salarian and got the sun lamp.
I was cleaning up other quests, and went to the Emergency S.O.S. site and encountered the grow operation.
In the conversation, I gave them the sun lamp and they said I could take a sample.
Herbal Entrepeneurs marked as complete in my completed tasks and has a ! next to it that won't go away. Also, the ! won't go away in front of the Completed Tasks folder.
I scanned the plants (it was pretty twitchy with the targeting in this one), and SAM suggested they might help (something I knew from doing the Oblivion-related quests earlier, weird narrative)
The Fever-related quest (I forget the name) will not trigger and appear in my quest list, and I can't interact with anything else in the room. I seem to be stuck at this point, a bug as far as I can tell.
Hope the details help!
Same situation as shadowchaser on PC.
Guy is still dying on the table even though I have the plant sample to cure him. Of course, I've returned to the nexus a few times since then now, so I could have brought him actual antibiotics or a whole medical team by now....
Yay broken quests.
