I've got a bug with the Silent Cave unique map.

The first time i've tried this map i've used a vaal orb in two of the four essences around the boss, opened the boss and the damage was surreal, died 2 times and left the map, got to the device and opened another map elsewhere. The second time i've found one Silent Cave i've tried with only three essences and used the vaal orb on the boss, again absurd damage in some of the skills from the essences but this time there was a fight and I tried until I was out of portals, thats ok I though.

Now the third Silent Cave i've found i've did the map, opened three essences and the boss without using a vaal orb and killed the boss, he dropped the greater essences but no book for the two atlas points and the map objective stay as saying "Defeat the Imprisoned Boss". Theres one essence icon showing on the map but I think thats ok cause i've killed the boss and it deactivates the essence that wasnt opened. So now what? Its not like this map is everywhere to me trying do it using all the four essences, only found three maps of these and even completing it I dont get the whole reward.