Question: When I leave a site's chatroom, I used to get redirected to the site rooms of my parent site (previously Hinduism.stackexchange.com now Movies.stackexchange.com). 

The following used to be the redirecting link while leaving a chatroom

`https://chat.stackexchange.com/?tab=site&sort=active&host=chat.hinduism.stackexchange.com`

But now, when I leave a chatroom, it redirects to 

`https://chat.stackexchange.com` where it shows only chat room. 

Why did the change happen? I am sure it's not because of change of parent site in chat.

Answer: 
As far as I can tell, this happens because the link is generated based on [referer header](https://en.wikipedia.org/wiki/HTTP_referer), which is not available if browsing chat using https, since [chat rooms are still not supporting https](https://meta.stackexchange.com/questions/295804/chat-not-always-https).

**If you will manually change the URL to http:// instead of https:// in the chat lobby/room, it will work.**

The actual bug here is having links to https:// version of the chat from the sites, which happens due to using relative links and not absolute, but that's better be reported as a different bug.

Adding HTTPS support to chat is the last stage of [Network-wide HTTPS: It's time](https://meta.stackexchange.com/questions/292058/network-wide-https-its-time), and I'm afraid it might still take a while.
Yes, as pointed out by Shadow Wizard the issue looks because of the problem with https::// in chat.

Until the issue is solved, I found couple of work-around:

* Just click on the address bar to have a typing cursor and press `Enter`, you'll find site rooms. (Note that reloading page doesn't work for me)
* Just use middle click instead of left click of mouse -- I mean open link for "leave" option in new tab and proceed further from new tab, you'll find site rooms.