I don't know if this was addressed before but for some reason, some users are unable to select their subtitle provider name when it shows up on the dropdown menu.The name will show up fine when typed but when clicked it will disappear instead of showing up in the box. It's working fine for me personally when I tested it but a recent contributor brought it to our attention that it wasn't working for them and it's been mentioned by someone else too previously.
The user is on Google Chrome!
Let me know if you need any more details!