The paging not display


I am setting to view the feedback comments, i am turn on Allow Paging and enter the Default Page Size value, example page size is 2. There are 4 feedback comments, but the feedback comments list just show the first page (2 feedback) the pagination not show, so i can not view the next pages.

When people fill the feedback form and submit, it said invalid security code, but i see the security code clearly and i check email the feedback information was send.

And some time it show error message: There is a problem with the configuration of your SMTP Server. Mail was not sent. but i i check email, the feedback was send.