Ghost user when use as my external api

I use iFrame API with domain on my website. But some of my users report that they experiencing issue after reload the page, their name become 2 in that room, feel like ghost user.

Is that anyone experiencing the same with me?

Did I miss something when doing iFrame API integration?

Does the ghost user disappear after some seconds?

I think more than 30 seconds and still on there. the ghost user still remains until we create a new room.
The weird thing is, its not happened to all user. it only happened to 1 of my user. Is that unstable connection produce the ghost user?

It’s possible. The bad connection could likely make the extinct presence seem like it’s persisting longer than usual.