Hi Tamara,
The bracket is moved to the top from the center of the lamp so the light bulbs can be right in the middle of the lamp. That how it was designed .
If you have a look at the metal plate that hold all the electrics the place for the bar is off center but the plate that holds the bulbs is right in the middle when you place the metal bracket to the wooden bar.
Those lamps take G-9 light bulbs - You have it in the description and in the title of the product on the website you have placed the order, also there is a label on the packaging you have received where you can find the info about the light bulb and there is a mark next to the G-9 light bulb.
Those light bulbs are very common and available almost everywhere.
Hope this helps :)