Hi @Claire_Painter,
Very similar to @robskils concern. Please see the attached for when I visited http://www.myproudmoments.com from my mobile device. It does properly render the guest checkout option. Under your circumstance, it may be best to file a ticket at https://www.paypal-support.com to determine the reason guest checkout is not rendering when you perform a test. Our Engineers would like to see a screenshot, the full URL of the page that does not render guest checkout and the time/date of the attempt. From there, they can locate a debug ID to determine the specific reason it is not rendering in your use case.
Again, the good news is, it is not occurring for all users who visit your site via mobile 🙂
Thanks,
Carlos
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