$ dig www.ldevdesigns.fr
www.ldevdesigns.fr. 282 IN CNAME ldevdesigns.netlify.app.
ldevdesigns.netlify.app. 27 IN A 54.66.176.79
ldevdesigns.netlify.app. 27 IN A 3.24.66.78
As ldevdesigns.fr is using Netlify DNS the record above should not exist. A NETLIFY record should exist for both the apex domain and the www subdomain. Likely you have removed the NETLIFY record for the latter.
In order to correct this, remove the custom domain from your site then reassign it. DO NOT delete NETLIFY records.
Alternatively, you can wait for a member of Netlify’s support staff to mend the DNS records for you (no guarantee how long that could take.)