Probleme an einer Stelle mit der Woocommerce-Übersetzung

We have a strange problem with woo commerce. We are using the German translation but in one spot, something is off: The "Place order"-button overwrites the correct, translated "Kaufen"-button. When you refresh the page you see "Kaufen" button but then it is gone for good as if the "Place order" button is just put over it. However, the source code only shows the "Kaufen" button [<input type="submit" class="button alt place-order-button" name="woocommerce_checkout_place_order" id="place_order" value="Kaufen" />]; in examining elements, however), I see only the original English "Place order" button [<input type="submit" class="button alt place-order-button" name="woocommerce_checkout_place_order" id="place_order" value="Place order">]. Anybody any clues what might cause this or where one can look to fix this?