Layout problems in Gravity Forms 1.5 beta 3.4

Robert is correct, the additional left padding on line 2246 of your style.css file is causing the field to wrap below the first one. You'll need to either tweak the value, or remove the property all together. Honestly, you can remove the entire rule.. the float isn't needed nor the width property. It's kind of extraneous.

As far as the scrolling, that's also related to too much vertical content somewhere. It's easily enough fixed by adding the following rule to your theme's style.css file.

body .gform_wrapper ul.gform_fields {overflow:visible}

On the checkboxes - the inconsistency isn't a fault of the form CSS, you've specified a margin on line 1776 of your style.css file that's adding just enough to force the third column to wrap. The list items are set to 33% width with 0 margin. That puts you at 99% of that available horizontal space taken up. Do the math.. if you add a 2 pix margin to each list item, that's 6 additional pixels of width.. in some browsers, that's enough to push it past what it considers the boundary and to wrap into a new line.

Remove the margin property you added and it should work consistently. Alternately, you can redefine the 3 column class so the width is 32% or some lesser value if you feel you need to retain that left margin property for some reason.

The best way to determine if formatting issues are related to the default forms vs. your theme is to see if the form is properly formatted in the preview page. if so, it's inheriting some additional properties from your theme.

Hope that helps out. I'm always looking for ways to improve the CSS, but with the plethora of theme's out there and inconsistencies in CSS & markup in the theme's it's impossible to "bulletproof" the formatting in every situation. We'll do our best to keep it as simple as possible though.