What is the name of your placeholder page?
Powerstore uses index.php for the home page. Usually you can set up a hierarchy of page names to use. So if your current placeholder is index.html it might automatically take higher precedent and it will stay until you delete it.
All you would do is make sure that the current placeholder is not named index.php and make sure it is using a name that is higher on that hierarchy... in some ISP admin sections that list is exposed and can be edited.