Hi Adi,
I have checked your site and figured out that it works on Bootstrap 2, when you switch to T3 blank template, it works properly as the markup is from Bootstrap 2. To make it work in Bootstrap 3 (that means it will work withy T3 bs3 blank template), please chang the markup from:
<div class="btn-group btn-group-vertical" data-toggle="buttons-radio">
<label for="data_register_registration_methodlogin" class="btn active hikabtn-checkout-login">התחבר לחשבונך</label>
<label for="data_register_registration_method0" class="btn">הרשמה</label>
<label for="data_register_registration_method2" class="btn">Guest</label>
To:
<ul class="nav nav-tabs" role="tablist">
<li class="active"><label for="data_register_registration_methodlogin" class="btn">התחבר לחשבונך</label></li>
<li><label for="data_register_registration_method0" class="btn">הרשמה</label></li>
<li><label for="data_register_registration_method2" class="btn hikabtn-checkout-guest active">Guest</label></li>
</ul>
Please check the result here:
http://easycaptures.com/fs/uploaded/803/2443707884.png
P/S: check the details of how to use Bootstrap 3 tabs at:
http://getbootstrap.com/javascript/#tabs
Gardner.