Hi there. We've just released a hotfix that should resolve this issue (was affecting players who completed Legacy of Zamorak before Twilight of the Gods).
Let us know if it's not fixed for you.
If you logged out in the Falador throne room, you'll need to go down the stairs and back up to set Saradomin and Adrasteia to their expected state.
From the stairs, you might get a prompt to choose which quest/season you're on, depending on how many other quests you have in progress that use the Falador throne room and can be progressed in non-linear order.
Note that there's a particular state in Twilight of the Gods where the quest journal says to speak to Saradomin but actually Adrasteia is there and continues the conversation. Checked with the quest's developer and that's intended.