header logo grows when .stuck

When using the sticky header I’ve noticed my logo growing slightly when the header turns into a .stuck header.
I’ve identified the problem down to the following line (style.css:573)
#logo img {max-height: 55%;}
… which is getting taken over by (style.css:579)
#header-inner.stuck #logo img {max-height:60%!important;}

I’ll be adding a correction in my child stylesheet, but I reckoned I would let you know.
I’m using a retina MBP if that makes a difference.