Logo Retina version

Hi there,
I come back to you for a previous topic : the retina version of the logo.
My non-retina logo is 362x36px, so my retina version logo is doubled as recommended to 724x72px. The problem I have is that on retina screens the logo is really double in size. I”ve already used this function on another site and it works perfectly: the initial logo is 250x54px and the retina version 500x108px, and the logo doesn’t get bigger on retina screen, it is just the same size but looking better in definition.
So, do you have an idea why this is happening ? If you confirm that my message will stay private I can send you the credentials.
Thanks for your help