Login screen bug

Since a few updates ago, there has been an odd bug when logging in. In case it is relevant, this is on an ios device.

Firstly, if I left the site on a chat screen when I last used the site, it will not let me tap the login button at all, and I have to return to the home screen and refresh the site before I can do so.

Secondly, when I do attempt to login, when I tap the text bar to input my email address, the screen whites out and the site refreshes itself. Only after all of this can I finally enter my details and login.

Is this a known issue?