Scheduled posts are sent out 2 hours after I scheduled them

Do you mean the post appears in the space 2 hours late or the email notifications for the post get sent 2 hours late? Or both?

Are you using a server CRON or the WordPress built-in CRON? https://github.com/WPManageNinja/fluent-community-docs/blob/master/recommended-server-config.md#server-side-cron

Not sure if that code is necessary. I just did a test on my site for a scheduled post and it posted as expected. I'm in Eastern time zone. This might be a case where getting support involved is needed.

This fixed it:
add_action('admin_init', function() {
if ( ! current_user_can('manage_options') ) return;

if ( isset($_GET['dryrun_fluentcommunity_fix']) || isset($_GET['fix_fluentcommunity_fix']) ) {

    if ( ! class_exists('ActionScheduler') ) wp_die('❌ Action Scheduler not available.');

    $do_fix = isset($_GET['fix_fluentcommunity_fix']);
    $store = ActionScheduler::store();
    $actions = $store->query_actions([
        'status'   => ActionScheduler_Store::STATUS_PENDING,
        'per_page' => 500,
    ]);

    $tz_amsterdam = new DateTimeZone('Europe/Amsterdam');
    $count = 0;

    $table  = "<h2>🧪 " . ($do_fix ? "Fixed" : "Dry Run") . " FluentCommunity Summer/Winter Time Corrections</h2>";
    $table .= "<table style='border-collapse:collapse;width:100%;border:1px solid #ccc'>";
    $table .= "<tr>
        <th>Hook</th>
        <th>Huidige UTC</th>
        <th>Huidige lokale tijd</th>
        <th>Nieuwe UTC (Corrected)</th>
        <th>Nieuwe lokale tijd</th>
        <th>Verschoven (uur)</th>
    </tr>";

    foreach ( $actions as $action_id ) {
        $action = $store->fetch_action($action_id);
        $hook   = $action->get_hook();

        if ( strpos($hook, 'fluent_community') !== false ) {

            $scheduled_date = $action->get_schedule()->get_date();
            if ( ! $scheduled_date ) continue;

            // Huidige lokale tijd
            $current_local = clone $scheduled_date;
            $current_local->setTimezone($tz_amsterdam);

            // Check zomertijd/wintertijd
            $is_dst = (bool) $current_local->format('I'); // 1 = zomertijd
            $offset_hours = $is_dst ? -2 : -1;

            // Nieuwe UTC berekenen
            $new_utc = clone $scheduled_date;
            $new_utc->modify("{$offset_hours} hour");

            // Nieuwe lokale tijd
            $new_local = clone $new_utc;
            $new_local->setTimezone($tz_amsterdam);

            $diff = ($new_utc->getTimestamp() - $scheduled_date->getTimestamp()) / 3600;
            $style = abs($diff) > 0 ? "background:#ffe5e5" : "";

            $table .= sprintf(
                "<tr style='%s'>
                    <td>%s (ID %d)</td>
                    <td>%s</td>
                    <td>%s</td>
                    <td>%s</td>
                    <td>%s</td>
                    <td style='text-align:center;'>%+.1f</td>
                </tr>",
                $style,
                esc_html($hook),
                $action_id,
                $scheduled_date->format('Y-m-d H:i:s T'),
                $current_local->format('Y-m-d H:i:s T'),
                $new_utc->format('Y-m-d H:i:s T'),
                $new_local->format('Y-m-d H:i:s T'),
                $diff
            );

            if ( $do_fix ) {
                // ✅ Herplan actie correct via ActionScheduler helper
                as_unschedule_action($hook, $action->get_args()); // Verwijder oude
                as_schedule_single_action(
                    $new_utc->getTimestamp(),
                    $hook,
                    $action->get_args(),
                    'fluent_community'
                );
                $count++;
            }
        }
    }

    $table .= "</table><p>✅ " . ($do_fix ? "Fixed" : "Checked") . " {$count} FluentCommunity actions corrected for summer/winter time.</p>";
    wp_die($table);
}

});

It could be that the timezone was not correct when the tasks where planned

Sam Jansen We’re using the WordPress timezone, so notifications should be sent according to your site’s time settings. If you’re not getting the expected result, please create a support ticket with temporary access. Thank you!
https://wpmanageninja.com/support-tickets/