Plugin: Login with AJAX – Lost password problem

One of my sites with Login with AJAX has a problem I cannot understand. When I click on ‘Lost your Password’ nothing seems to happen. I would expect the dialogue box for forgotten passwords to appear underneath the login box bu it doesn’t. If however I open the link in a new tab it works fine.
This is the site with the problem https://mowgli.org.uk and here is another of my sites where it is still working fine https://hysterectomy-association.org.uk