Ssl problem on sub domain

i have ssl redflag problem on my subdomain which is https://ci4.mungboimedia.ezyro.com/

My main domain-https://mungboimedia.ezyro.com has no such problem. My question is why the subdomain did not share the ssl of it upper domain ? How to set such that ‘https://ci4.mungboimedia.ezyro.com’ shared the SSL of ‘https://mungboimedia.ezyro.com’ ?? any help needed.