HTML - problemas con iphone y el submmit

<button class="btn btn-primary btn-block ios" type="submit" data-track="subscribe submit" data-settings="subscribe_checkout;submit">Kostenpflichtig abonnieren</button>

<input class="btn btn-primary btn-block ios" type="submit" data-track="subscribe submit" data-settings="subscribe_checkout;submit" value="Kostenpflichtig abonnieren">