Hi,
The function <?php wp_head(); ?>
is found here.
https://github.com/presscustomizr/customizr/blob/master/inc/parts/class-header-header_main.php#L132
It’s being hooked into an action hook in header.php
A Theme without <?php wp_head(); ?>
will never be approved for listing in www.ads-software.com repository.
That “error message” is produced by one of your plugins.
You can disabled one plugin at a time to find out which plugin is printing that redundant “error message”.
As for your disappearing widgets. You can try the following troubleshooting steps.
1) You can clear your W3 Total Cache plugin’s cache content.
2) Or find out if there is any plugin causing conflict, by disabling one plugin at a time.
I notice your website took a long time to load, a website with over loaded resources can cause weird issues.
Thank you