The width of the logo can be adjusted to make it appear normal on retina displays. You'll just have to edit the theme to adjust the width. Can you send us a copy of your logo and theme file (Settings > Themes > download the file under Published Theme) so that we can update it for you?
Here is the theme. 72px for the width is ok.
Can you also share a copy of the logo?
Here it is
Please find the updated theme file attached here.
Thanks working perfectly