why won't my image center

Is this form http://www.jotform.us/form/50164221288147 ?

If so please select align > center:

You can test it here:

http://form.jotformpro.com/form/50203946683962? 

If it is another form please let us know the form's url so we can investigate further this situation.

If you need further support please let us know.