safari glitch with membership plugin

I am testing the membership plugin on my new site

The sign in process works fine in all browsers except Safari. When the sign up is completed in other browsers a page comes up telling the subscriber that the sign up was complete.

In Safari they are taken to a page that offers them the choice of 'trial', which is the only level I have available right now,

Unfortunately there is no clickable link attached to the word 'Trial' so the sign up cannot be completed.

How can I fix this?