Problem with DHL delivery

Hello,

we are using you plugin on one of client sites: https://mikro-plus.de

Since some time we got problems with getting to payment, we are using extra plugin for DHL delivery:

https://github.com/shadimanna/dhl-logistic-services-for-woocommerce – we already spoke with plugin developer, and he told us to contact you – as he thinks issue is caused by you plugin as it don’t know how to handle extra delivery fee which is added by DHL plugin.

Add something to basket, choose DHL delivery with exact day and hours. After that paypal payment – and will stuck with error message.

Any chance you can help?

The page I need help with: [log in to see the link]