This would not be a platform issue, but a developer issue with the layout of your HTML.
So first start with here to validate your HTML and see if from a functional perspective you need to clean up some code:
http://validator.w3.orgThen the best way to know is test your code here:
http://litmus.comIf your using P tags you might find using separate TRs and TDs is best practice. You could cheat with BR tags, but really it comes down to some dev time in how your code stacks up.
Hope the above helps. It is not always easy to design collapsable clean code for outlook.
All the best,
Rob James