When enabled, with 2+ items in the cart, stripe assumes the total cart price is the price for each item.
So two $5 items totals $10 in the XF cart, Stripe tries to charge $20 ($10 x 2).
Four $12 items totals $48 in the cart, Stripe wants to charge $192 ($48 x 4).
If you disable the itemized checkout, Stripe charges the right amount.
Also, 'itemised' is misspelled for this option in the ACP
So two $5 items totals $10 in the XF cart, Stripe tries to charge $20 ($10 x 2).
Four $12 items totals $48 in the cart, Stripe wants to charge $192 ($48 x 4).
If you disable the itemized checkout, Stripe charges the right amount.
Also, 'itemised' is misspelled for this option in the ACP