Hello,
We have just checked out your Page: http://clearflat.co.in/projectdetails.php?pid=AP5b5e9bdfb401d and the AJAX on Load functionality appears to be working fine for us at the moment. As you mentioned, the SEMICOLON.portfolio.ajaxload(); Function Call is required on the Page to make the AJAX on Page to work properly. So if it is not working, the issue maybe because the Function was not called on the proper AJAX callback. Try to delay the Function Call to fix this.
Additionally, while we are always here to help you out with issues related to the included Features on the Template, there are limitations to provide support on certain features if there are too many Customizations on the Page resulting in the feature not working properly.
Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.