Ssl not working perfectly


#1

I have added flexible ssl to one of sub domain.
And the page open with https.
But like my root domain it doesn’t show green lock.
Dub domain is
onlinetest.sbfied.com
What will be the possible reason and how to rectify it


#2

Mixed content due to:
http://onlinetest.sbfied.com/wp-content/uploads/2019/01/cropped-IMG_20190115_002111.png
http://sbfied.com/wp-content/uploads/2019/02/1549096502952191-e1549096766223.jpg