Disable Elytra

If you pickup an elytra then it will automatically drop it or remove it from theg inventory depending on the settings of the gamerule that is added by the mod.

/gamerule elytraDrop true (Default) - It will automatically drop the elytra to the ground if you have an elytra in your inventory.

/gamerule elytraDrop false - It will delete the elytra from your inventory if you have an elytra in your inventory.