This is a conflict with the template/theme on your site. The following style is what's causing the issue:
.control-group {
width:100%;
}
To fix this:
1. You can add the following style:
.sclogin .control-group {
width: auto;
}
2. After #1, you'll see that the width of the module is still not all in one line, but this is because the module is in a template position with width of 23.5%. With the browser tools, I changed it to 100% temporarily and they are all in line at that point. I would suggest either moving the module to a different position, creating a new position or changing the css width of that position (whichever of these fits best for the rest of your site content too).
-Melissa