Hi @Aaron_M_1983,
Welcome to the community and thank you for your post.
I do understand your concern with this. There can be a few reasons that your customer (or you) may be experiencing issues checking out as a guest.
In some cases, PayPal will only allow you to use a card a certain amount of times on PayPal as a guest before it will prompt you to create or use your PayPal account. Also, if the system picks up that your customer has a PayPal account, it may urge them to log in.
I would recommend them to clear their cache and cookies or using an alternative browser to try and check out again as a guest. The system should not pick up that they have an account if your cache and cookies are cleared or if they are using an alternative browser.
I hope this helps!
- Rachel
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