Leopold,
This is one of the localization issues which disturbs many israeli (RTL language) users
when using DNN.
In the israeli version we define dir=rtl for all the containers,
The registration page is the only page which is still aligned to left after
addign that line.

This module (registration) render the following line which is probably
responsible for the problem:
<div style="float: left...

I can't find where to change this.
I'll be glad if u can help.

Thanks.