iOS Push Notification Banner shown twice for a single Push

Question

I\'ve noticed that sending a Push notification results in the following behavior:

See how the banner is shown a second time, after a short delay?

At

Answer 1

I think the wrong answer is accepted here (If this is about migrating from Parse to OneSignal). Because for OneSignal there doesn't seem to by any proper solution for this. I am also looking for the solution if any one is having. The only workaround for this was, to restart the phone.

But its weird. We can't ask all the users to reboot their device.