Problem with using this Plugin and Authorize.net

Hi, can you tell me if you have tested the plugin with Authorize.net instead of Stripe? It seems to work fine for me with Stripe but when I switch to Authorize.net, after completing the form and filling in the credit card info, the site shows a page not found error due to a very ugly URL trying to be used such as this: https://dl.dropboxusercontent.com/u/4138085/plugin-error-url.jpg

This does not happen when the plugin is not activate.

Thanks,
Greg

https://ww.wp.xz.cn/plugins/gravity-forms-checkout-info-add-on-for-ithemes-exchange/