Is this normal behavior ?
I checked the gateway-core-ipn.log, found entries with the amount matching one of the products that has recently sold on our site (and the s2Member options does not have this amount). Also the description listed the name of that specific WooCommerce product.
Either something is broken, or the description is incorrect:
Description for gateway-core-ipn.log: This log file records all communication between s2Member and the IPN/Webhook/Callback services associated with various payment gateways. All transactions pass through s2Member's core processor, and they will be logged in this file; including transactions processed via s2Member Pro-Forms—for all Payment Gateway integrations.