I think I broke my elytra
Solution 1:
This is likely either this bug (first world you join after starting the game has issues) or this bug (after teleporting a long distance, you get issues) or any of the related ones. Exiting and re-joining the world should fix it.
Solution 2:
This might be a normal thing where the elytra runs out of durability. You can repair it with another damged elytra, or you can get another one. If the elytra looks tattered, then that means it has 1 durability left (they never break, but you can't use it when it has 1 durability left)