Why does this happen, I make a new site in WordPress Multisite Network and the new site is always stuck using “http://” even though SSL is active.
It’s because WP Core devs think new sites might not have SSL installed yet:
Forcing New Sites to HTTPS in a WordPress Multisite Subdomain Network
Trac ticket proposed a fix, but not accepted yet: https://core.trac.wordpress.org/ticket/27499
yah this is super annoying on Multisite networks
HTTPS outnumbers HTTP sites for WordPress already, doesn’t it? no reason to keep HTTP as the default anymore, esp. for security reasons.
Enter the destination URL
Or link to existing content