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How do you know that you were at #1 in position and got only 25? The system is automated and can't go wrong. Maybe when you checked you were on top but someone else got more points overtaking you after that!
I think if you are on the top, you get Rs 50, next 4 members get Rs 25 and rest others whose names are there get Rs.10. I think this payment is irrespective of your levels. I remember getting Rs 25 even when I was new to the site.