Question: why does the oghma infinium disappeared?
Answer: 360 PS3 XB1 There is a small chance that dropping Oghma Infinium will cause it to disappear forever. This has been observed once inside Lakeview Manor. PC 360 PS3 If the Dragonborn activates a bookshelf, then goes to the Oghma Infinium and reads it, they can go and place it on the bookshelf and it will not disappear.