MySQL returns only the first character of the fields, but works fine on local

I don't know what is going on exactly, but all only the first character is returned for all my columns when I uploaded my website. It works perfectly fine on a local machine.

I found a similar question here, but I didn't manage to find the answer:
https://stackoverflow.com/questions/10507848/mysql-query-returns-only-the-first-letter-of-strings-only-when-page-is-viewed-on

    // Log Table Query
    unset($stmt);
    $stmt = $db->stmt_init();
    $stmt = $db->prepare( "SELECT * FROM logs ORDER BY `id` DESC" );

    $stmt->store_result();
    $stmt->bind_result($r_id, $r_time, $r_logger, $r_message, $r_category);
    $stmt->execute();

    while( $stmt->fetch() )
    {
        var_dump($r_message);
        var_dump($r_category);
    }

    $stmt->close();

This outputs on localhost for example:

string(5) "Hello"String(3) "Cow"

But on the live server:

string(1) "H"String(1) "C"

Any ideas?

Edit

I think that this applies only to string types. The integer types return for example:

int(2893)