Customer can print invoice

-- url of the page with the problem -- : voel.be
-- HikaShop version -- : 3.5.1
-- Joomla version -- : 3.8.8
-- PHP version -- : 5.6.36
-- Browser(s) name and version -- : Google Chrome 67.0.3396.99

Hi support,

I have enabled the "my account" module and then can click "view your orders".
This lists me the previous orders, and when I click on a order number, I see the items bought,
however I do not have an "invoice" button like I have on the backend, although i'v set it to yes in the backend under general options. My customers only see the icons as in the attachment.