Error path when load css for wp-admin

My wordpress is installed in a blog subfolder on the root of my server. I’ve installed many WordPress before and I can’t find why it is happening.

When I log in to the admin area, the CSS doesn’t load. When I look at the source, I see it tries to load : https://lagi.com/wp-login.php?redirect_to=http%3A%2F%2Fawslagi.com%2Fwp-admin%2F&reauth=1

path css : https://lagi.com/lagi.com/wp-admin/load-styles.php?c=1&dir=ltr&load%5B%5D=dashicons,buttons,forms,l10n,login&ver=4.5.2

It of courses gets an error 404. /wp-admin/ is present twice in the url and I can find why and how to correct it. My blog url is properly set to https://lagi.com/blog in the settings.

Tell me if you need more details, I’m not sure of what could be useful informations or not.

Thanks for your help.