I could only recreate the issue on a Windows 10 browser and am guessing, the issue was caused by the order_type AJAX request being sent before the page completely loads. I did make some few changes and it seems to be working now. Try the fix below and let me know if it also works for you.
https://github.com/tastyigniter/TastyIgniter/commit/4c2e8b6d2510d270f841dd4e1f61dc3361dde4e4