Php – Else statement always shown even thou I didn't do any activity

This is my code

<form action="event_feed.php" method="POST">
            <label for="title">Event Title:</label>
            <input type="text" name="title" id="title" required>

            <label for="description">Description:</label>
            <textarea name="description" id="description"></textarea>

            <label for="date">Date:</label>
            <input type="date" name="date" id="date" required>

            <label for="time">Time:</label>
            <input type="time" name="time" id="time" required>

            <label for="location">Location:</label>
            <input type="text" name="location" id="location" required>

            <input type="submit" name="create_event" value="Create Event">
        </form>

<?php
        // this is for creating event
        // Process form data when form is submitted
        if (isset($_POST['create_event'])) {
            // Get form data
            $title = $_POST['title'];
            $description = $_POST['description'];
            $date = $_POST['date'];
            $time = $_POST['time'];
            $location = $_POST['location'];
            // Insert data into database
            $queryCreate = "INSERT INTO events (Event_title, Description, Date, Time, Location) VALUES ('$title', '$description', '$date', '$time', '$location')";
            $sqlCreate = mysqli_query($conn, $queryCreate);
        } else {
            echo '<script>alert("There was an error, please try again")</script>';
        }
        ?>

Hello There I was Creating our capstone my question is why

else {
     echo '<script>alert("There was an error, please try again")</script>';
}

is always executing even if I didn’t do any activity?

I expect that my code was correct but there was an error that i need to resolve, When i clicked the ‘event’ page the else statement is shown