I use oxwall 1.7.2 on windows and in join page the username field is hidden when second user wants to join.
Also all other fields are seen with random order.
If it is local try to install xampp instead of wamp and try again.
If it is online, you'll need to change your hosting or server to linux. We are aware of this issue. However the developers have not found out the reason. We are still working on that.