CNAME Records gets auto deleted, HELP ME

HI,
I am creating a subdomain of my website www.mywebsite.in through CNAME.
subdomain is abc.mywebsite.in and it points to www.otherwebsite.com, but every time when i add these records in Cloudflare’s CNAME, if gets auto deleted after some time. I don’t understand why is this happening.
www.mywebsite.in is hosted in google blogger and abc.mywebsite.in will be hosted on www.otherwebsite.com server.
Please help me to resolve this issue ASAP.

Is your domain already using the Cloudflare DNS nameservers, or are you in the process of moving your DNS settings?