Downrate & Uprate Problem

Can anyone please help me.
Every time i uprate someone my computer always give me a error and gives the someone more points than i was planning to give. If i uprate by 1 point i give 3 points
2 points i give 4 points
3 points and i give 5 points
sometimes i even given 10 points
and thats not only the problem
whenever i downrate i give the someone 3 points or more
can someone please help me???
i dont want to give some much points out
but if u cant help can please give me a link to a post which is worthy of uprating more??