Hey @Donna Sofia 

This is indeed weird

I would suggest reading this answer to a similar question someone had posted a while back

I would suggest contacting klaviyo chat support if the issue still persists, and they would be able to look into this in more detail as you can share them a link to your template.

I hope this helps and thank you for being part of the community

Cheers

Arpit

 Hi @Donna Sofia 

I’ve had this issue before with Shopify with the standard checkout url redirecting to the home page even though it’s been working OK previously. I never really got to the bottom of it.

However, adding this as the link to the return to checkout button works (provided to me by Klaviyo support):

{% with event.extra.line_items as items %}{{ organization.url|trim_slash }}/cart/{% for item in items %}{{ item.variant_id }}:{{ item.quantity|floatformat:'0' }}{% if not forloop.last %},{% endif %}{% endfor %}{% endwith %}?checkout%5Bemail%5D={{ email }}

Hope that helps

Andy