just to support this. Myself and others have also reported a significant uptick in duplicate orders with woocommerce since last week. We initially thought it was PayPal-related but have also seen similar issues with Stripe.

Here are a few mentions of this problem I have found from last week. I believe they're all related.

https://wordpress.org/support/topic/duplicate-orders-double-charging-customers/

https://wordpress.org/support/topic/duplicate-orders-customers-being-charged-twice/

https://wordpress.org/support/topic/customers-being-charged-twice-creates-duplicate-orders/

https://github.com/woocommerce/woocommerce-paypal-payments/issues/3231

https://www.upwork.com/freelance-jobs/apply/have-double-orders-coming-through-for-woocommerce-Started-few-days-ago_~021902816864695707834/