Solved it. By default, woocommerce doesnt change the price to the correct price, its always 25-39 Euro. But I am using a plugin that does the trick. I just had to remove
<div class="product-arrows pull-right">
<?php previous_post_link_product(); ?>
<?php next_post_link_product(); ?>
</div>
from content-single-product.php in order to make it work. Guess it’s related to the position of this function…