Checkbox labels on the right cause weird spacing issues between fields

We have a form that has a field set with multiple checkbox lists in it. It formats fine if we have the checkbox labels on the left, but when we select Labels on the right it adds a bunch of random extra spacing between the fields (this happens if we move the fields outside the fieldset as well) 

I'm assuming I can remove this spacing using custom CSS, but I can't figure out the specific code I need.

Anyone know how to fix this?