Contact form success page forces HTTP, returning security warning in Chrome

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Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST} !^domain\.com$ [NC]
RewriteRule ^(.*)$ https://domain.com/$1 [R=301,L]

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// HTTP
define('HTTP_SERVER', 'https://domain.com/');

// HTTPS
define('HTTPS_SERVER', 'https://domain.com/');

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define('HTTP_SERVER', 'http://domain.com/admin/');
define('HTTP_CATALOG', 'http://domain.com/');

// HTTPS
define('HTTPS_SERVER', 'https://domain.com/admin/);
define('HTTPS_CATALOG', 'https://domain.com/');

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[Mon Dec 14 05:44:20.977882 2020] [:error] [pid 13317] [client 172.68.141.167:21492] PHP Fatal error:  Uncaught Exception: Error: Connection timed out (110) in /var/www/domain.com/public_html/system/library/mail.php:339\nStack trace:\n#0 /var/www/domain.com/public_html/catalog/controller/information/contact.php(51): Mail->send()\n#1 /var/www/domain.com/public_html/system/storage/modification/system/engine/action.php(51): ControllerInformationContact->index()\n#2 /var/www/domain.com/public_html/catalog/controller/startup/router.php(49): Action->execute(Object(Registry))\n#3 /var/www/domain.com/public_html/system/storage/modification/system/engine/action.php(51): ControllerStartupRouter->index()\n#4 /var/www/domain.com/public_html/system/engine/front.php(67): Action->execute(Object(Registry))\n#5 /var/www/domain.com/public_html/system/engine/front.php(57): Front->execute(Object(Action))\n#6 /var/www/domain.com/public_html/system/framework.php(205): Front->dispatch(Object(Action), Object(Action))\n#7 /var/www/domain.com/public_html/s in /var/www/domain.com/public_html/system/library/mail.php on line 339, referer: https://domain.com/index.php?route=information/contact

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#Redirection code starts
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/\.well-known/acme-challenge/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteCond %{REQUEST_URI} !^/\.well-known/cpanel-dcv/[0-9a-zA-Z_-]+$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/(?:\ Ballot169)?
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#Redirection code Ends
RewriteEngine on

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    RewriteEngine On 
    RewriteCond %{HTTPS} off 
    RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]