Is this done by voting with different Ip addresses
like voting on my phone and pc so can get double votes.
I think this is cool if possible. I haven't tried but i will and verify if it works soon. (by Friday)
This isn't the reason. Some of the vote links (TopG) has a 12 hour cooldown, and another, I can't remember which, has like a 20ish hour cooldown. Some people set timers and things like that to get max votes possible (which is like 6.5 per day or so).