Tetaquas Thanks for the additional info! It looks like the way NoFall detects if you are flying with an elytra is unreliable.
Unfortunately I don't have a great solution for this problem. It's unclear what exactly causes these elytra issues that only some users are seeing.
What I can do is change it so that NoFall will be paused whenever you are wearing an elytra, even while you're not actually using it. This will make sure that NoFall can't randomly unpause while you're flying around, but it also means if someone is walking around on foot while merely wearing an elytra, then they won't be protected from fall damage anymore.