Apex domains cannot have CNAME records.
Question and response
Question
dig loading.es. NS
Answer
loading.es. 5 NS ns-110-a.gandi.net.
loading.es. 5 NS ns-52-c.gandi.net.
loading.es. 5 NS ns-79-b.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0