Merchant gets error messages in prestashop 7.6.4 and Billmategateway v.3.8.3

[OskarOstlund]

One of our merchants updated to the latest version of our prestashop module and gets error messages in his store where it claims that orders placed as invoices has the status "payment errors" as can be seen in the picture attached below:

However despite this does the order show up in our portal without issue. Similarly as can be seen above are two orders placed at the same time, one that only includes the invoice fee.

Similarly do we have some issue with card payments placed at the same time where the checkout locks with the below attached image visible as the only error message.