I can't see what I writing when I subscribing -Membership plugin

Hello,

A weird thing is happening to my Membership plugin. If you try to subscribe, you can't see the what you are writing in the different field (name, email, password…:wink:. Its looks like the fiels are too small : http://positifstyle.com/s-abonner/?action=registeruser&subscription=2

What is happening and how to fix this? Thank you in advance.

Regards,