Have you ever had issues like below when you tried to add a new attribute on CRM 2013 form which has a large display name and the full attribute label is not available on the form(In the below screen refer to the second field label on the form):

The resolution for this problem is to go to form editor->Section properties and increase the field label width property:

I changed it to 200 in my case and here is the result:

Hope it helps!