django query different for mysql and sqlite and server

Just happening strange to me...

I have a view where a piece of code is

notif = Notification.objects.get(id=self.npk, body=q, viewed=False)
            notif.viewed = True
            notif.save()

Here I just want to update the notification to be viewed true.

Strange thing is when I test it locally in my localhost it gives exactly what I want that is it turns the notification viewed to true.

But in production it dont change the notification viewed to true.. I was using sqlite in my development and thought of using mysql in development too because I am using mysql in production.

Even after using mysql in development there is no error. It turns the notification viewed to true in development and in production it dont change.

I mean the notification is not saved as viewed=True

Is it happens or its only me ? Tried all the possibilities but no solution. Need help.

Same query with same database works in development but not in production. Why ? Is anything wrong with server ?