page size and font size changed automatically, super small

What form are you referring to? I assume by your last form edit, that this is the one: http://www.jotform.us/form/51721051978154

It looks fine, and I do not see any change when loading, it stays as it shows. If you wan to change font size of your form, here is how: http://www.jotform.com/form-designer/tuts/episode2/

If, this is no the form, or not what you mean, we would appreciate more details, like browser and device you see the problem. If you could share a screenshot to illustrate what yous see, here is how: http://www.jotform.com/answers/414264-How-to-include-screenshot-image-in-the-support-forum