Weird layout, not really centered

i have both plugins, the standard paypal button (buy now) and the subscription one. weirdly, the latter does not center the button as expected. so it looks weird and different, even without any other WP editor formatting.

here is a screenshot: https://imgur.com/a/v3u6J7H
the text above is completely centred and the normal buttons are as well. subscriptions are off to the left.