Paypal Express Checkout - product option being lost?

I installed the Paypal Express checkout button on my site earlier, which is running OC2.0.3.1

I tested it and all was working OK. I even have my test transactions which definitely worked correctly

I just noticed that when the Paypal Express checkout button is used, after the paypal login step the user comes back to my site to confirm their shipping method - at this point the 'Option' the user selected for the product is lost - blank, just not showing anymore.

Its shown in the cart before pressing the number - and shown in the cart if I don't complete the transaction.

If I complete the checkout using the normal checkout procedure it works correctly

Any idea's??

My site is https://shop.angeldancewear.co.uk/

I found the below in the error log

2017-01-01 20:41:25 - PHP Notice: Undefined index: option_value in /www/sites/52c/8c8/shop.angeldancewear.co.uk/web/catalog/controller/payment/pp_express.php on line 469
2017-01-01 20:42:12 - PHP Notice: Undefined index: option_value in /www/sites/52c/8c8/shop.angeldancewear.co.uk/web/catalog/controller/payment/pp_express.php on line 957

Hi, just wondered if you found a fix for this as I enabled this the other day and got the exact same issue, luckily I discovered the fault after only a few orders and was able to remove the express button before it got out of hand.