Javascript elements not staying open (submit score, flag match etc…)

Strangely, the login pop-up element stays open…

However, any match related javascript elements refuse to remain open.

See GIF: https://media.giphy.com/media/4JUmNar4liwiTrsvo7/giphy.gif

Any idea what might be causing this? Updated this to latest version yesterday and saw issue for the first time.

Is this a conflict you can help me identify in my system, or is it a code issue?