The zen cart search button defaults to just a default form submit button. On my test site I have the updated Css Buttons installed, so that is why it is using my custom button.
You can override this function by opening up includes/templates/YOUR_TEMPLATE/sideboxes/tpl_search_header.php
and make line 19 match line 17.
As for the search, try making sure that in "Tools" "layout Boxes Controller", you have tpl_search_header.php OFF for the LEFT/RIGHT column status and ON for the header only.
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