You are playing Nightmare mode.
Do not discard unresolved shadow cards from Shelob at the end of the combat phase.
While Cleft of Cirith Ungol is in the staging area, players cannot travel to locations not named Cleft of Cirith Ungol.
...she was there, who was there before Sauron, and before the first stone of Barad–d–r; and she served none but herself, drinking the blood of Elves and Men, bloated and grown fat with endless brooding on her feasts, weaving webs of shadow...
The Two Towers
Begin with the standard quest deck and encounter deck for the Shelob's Lair scenario.
Remove the following cards, in the specified quantities, from the standard encounter deck:
4x Mogul Orc
2x The Under-way
3x Deep Dark Passage
2x Many Openings
Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard Shelob's Lair encounter deck.
Finally, flip this setup card over and place it next to the quest deck. Its effect remains active throughout the game, which is now ready to begin.
Forced: When Foul-smelling Cave is explored, place 1 resource on Shelob, if able.
Shadow: Attacking enemy gets +1 
(+2 instead if attacking enemy is Shelob).
While Torech Ungol is in the staging area, Shelob gets +1 and +1 
Travel: Exhaust Sméagol to travel here.
There agelong she had dwelt, and evil thing in spider–form, even such as once of old had lived in the Land of the Elves in the West that is now under the Sea...
–The Two Towers
Immune to player card effects.
While Cobwebbed Tunnel is in the staging area, each Underground location in the staging area gets +1 and +5 quest points.
Travel: The first player reveals an encounter card to travel here.
3
2
4
When Revealed: Either discard a random card from your hand, or engage Orc of Minas Morgul and reveal an additional encounter card.
Shadow: Attacking enemy gets +2
5
3
5
Forced: After Under-gate Sentry attacks and destroys a character you control, discard a random card from your hand.
Shadow: Either discard a random card from your hand, or exhaust a character you control.
When Revealed: Each player removes a character he controls from the quest and exhausts that character. Until the end of the round, characters cannot be readied by player card effects.
Shadow: Exhaust a character you control. Until the end of the round, that character cannot ready.
When Revealed: Deal Growing Stench to Shelob as a facedown shadow card.
Shadow: Defending character cannot ready. If the attacking enemy is Shelob and this attack destroys a character, place 1 progress on Shelob.