Installing SSL , Detected Image That Not Secure .

recently i just install SSL to my site ,
migration from http to https done and my site running very well

but the problem is :
“connection is not secured” status shown up

so i try to scan my website via : https://www.whynopadlock.com/
and the result show me that the only one of insecure items is my navbar logo ,

how to fix it ? i have try to reupload new file of my navbar logo and remove the old navbar logo that detected as insecure item from media , but “connection is not secured” status wont go away .

Detail :

my site : https://ngelag.com
Insecure URL: https://ngelag.com/wp-content/uploads/2016/01/logo-nav-Copy.png

Image that detected as insecure item has been deleted , so insecure URL above will end on 404 not found page