Bug after Update: Only One Item Shows in Cart, All Items Summed up in Total

Now that we have updated the Woocommerce plugin the 2.3.13 version (as well as woocommerce booking – 1.7.11, Woothemes Helper – 1.5.9), we are facing a problem with booking one and the same product for various dates correctly. The feature worked fine before the update. Now, if we book one and the same product for various dates, only one record appears there in the shopping cart (the product, which was booked first), the number of products equaling to 1. At the same time, the Total sum of purchases shows all the orders for various dates summed up.

Example: a scooter was booked twice, for the 13th and 20th of August. Only one booking shows up in the shopping cart with the price of 9900. At the same time, Total shows the sum of both the bookings – 19800. Please see the screenshot here: http://i.imgur.com/SZKOJyn.png

We would like to see all the bookings made in the shopping cart one by one as it was before the update. Is there anything we can do on our side to fix the issue? Or can you help to fix it somehow?

Thank you!

https://wordpress.org/plugins/woocommerce/