Credit cards not closing out on mobile

[otgrouch]

I use eprocessingnetwork for credit cards and it appears not many people do.

I chronicled my efforts to get the old 2.2 add-on working here:  

 

I thought I had it working, but have come to find out that it only works as it should on a PC.  On mobile, when you click 'continue' after a successful payment, it brings you back to the index page of the store and you're logged out.  All items remain in your shopping cart and it doesn't close out the order.   This is becoming burdensome as I have to manually push the orders through using 'check/money order' as the payment type - and that assumes the items are still in the customer shopping cart.

Is there anything that would different in how BS handles a return to the site from how the desktop version does?