Also, why is my number so low?
The current version of the Alpha only has a limited number of ways to earn reputation, therefore everyone's reputation now appears to be low. Don't worry! There is no penalty in this phase of the Alpha for low reputation.
The number next to your name shows the current weighting that your vote carries. The higher the rep, the higher the weighting. You can see the formula for that here.
If you see a 1.0 next to a name it is because that vote was cast before the reputation system was released. We assumed a 1.0 rating for any vote before this version was released. Any votes after the release have the current weighting.