Problem with Paypal Checkout

I am testing paypal on a ShopperPress theme and
1. I select a product and price the click the green button “buy”
2. I see the items I selected and prices are correct and click “Pay now” (I translated the text on these buttons so I dont know the exact wording)
3. I arrive to the Personal details Form and I Fill out the form and click next.
4. Then I see a confirmation page with the items I´m trying to buy and my personal info in the ORDER CONFIRMATION PAGE.
5. So far so good. But then I press continue and I am NOT sent to paypal so that I can pay
but instead I just see a blank page with a title that reads:

ORDER ID -171403035581

I have already set up paypal with my email address (the same I use to access my paypal account) and paypal is ENABLED.

I called paypal sto see if there was a problem with my account and Im told my account is able to receive payments.

So I do not see what I am missing here.

Can someone point me to where my problem might be?

The site is: https://www.tecpres.com.mx/