Please share your site url so that I will give you exact solution
As I checked,Your logo image,its not located in the center....
So Please design logo image in which logo located in center..
Please check screenshot..
problem in logo image
please correct a image beacuse image white space top aur white space bottom
too much large
Crop your image in the way that the logo text appears in center
As I checked your site...Now the logo is fine...
If you want bigger size logo then you have to increase your logo font when you design it...