We made the sale and received £11.93.

We made the full refund on Stripe on TB £11.93.

Automatically it made the Credit Slip of £5.94 and not £11.93.

The credit slip isn’t created with the amount of the full refund, the amount of the product and shipping, but only with the amount of the product.
The Credit Slip can use the amount refunded for a full or a partial refund.
We made the sale and received £11.93.

We made the full refund on Stripe on TB £11.93.

Automatically it made the Credit Slip of £5.94 and not £11.93.

The credit slip isn’t created with the amount of the full refund, the amount of the product and shipping, but only with the amount of the product.
The Credit Slip can use the amount refunded for a full or a partial refund.