sometimes square payment link is returning a download file in mobile and page not found in brower

[buildbots]

I am takin payments with my website (Vue/django app). Sometimes (about 50% of times) when I am redirecting the customer to the Square payment gateway, the link comes back saying "page not found", I refresh the link and then it works, but the customer will not do this so I am losing sales. 

In mobile it's even worse, 90% of the times the redirect links comes back with a blank page and a "download" option. 

[buildbots]

If I go back to the vue application, I can retry and retry until it works. But again, the customer will not do this and just drop the transaction.