The pinnacle stuff doesnt work so good

so i am looking for 3rd draiocht key thing and somehow the two maps i completed that had the key are able to be finished again including a tower. is the tower okay to do again and will it buff the same area with the different stuff or delete current bonuses if i put in new tablets? im not sure if that will lock up the character or kill the end game so i will not attempt it but there is no 3rd draioght thingy or anything else the blue wisps are liars.

the first fight i did tavokai got stuck in the first phase and wouldnt go into the second phase just became locked up and invulnerable and locked my character in the area got a map failed for waiting the 15 minutes for area to reset. the second i cant even start the map area.this content seems very bugtastic and it is kind of discouraging.