Payments pending, sometimes not completing

Hey, first thank you for this wonderful plugin. But I’ve been having an issue recently of payments failing or getting stuck in “Pending Payment” status or “Processing” status.

I’m not sure what’s going on or if it’s because of my caching plugin or some other conflict. But this has really affected my sales and causing many issues, especially since I have people on payment plans (instalments) and now these instalments are failing.

Any help would be appreciated.

The page I need help with: [log in to see the link]