Ya, the content you're putting on the page is what's giving https error messages. Has nothing to do with PayPal.
One of your plugins is specifically forcing http:
Code:
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js" type="text/javascript"></script>
For your video links, you've got:
Code:
<div class="additionalImages centeredContent back" style="width:%;"><a href="https://www.youtube.com/watch?v=-RkdM6U8eIY" class="youtube"><i class="fa fa-play-circle" aria-hidden="true"></i><img style="max-width:100px;max-height:100px;" src="http://i1.ytimg.com/vi/-RkdM6U8eIY/1.jpg"/></a></div> <div class="additionalImages centeredContent back" style="width:%;"><a href="https://www.youtube.com/watch?v=LUwjUV1BYv4" class="youtube"><i class="fa fa-play-circle" aria-hidden="true"></i><img style="max-width:100px;max-height:100px;" src="http://i1.ytimg.com/vi/LUwjUV1BYv4/1.jpg"/></a></div>
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