Hi Mohamed,
I can't reproduce it right now, as we have people paying for an auction that just finished. Basically, I have the payment method for Paypal setup with a return URL. When in Hikashop, it works marvelously. The user goes thru checkout (not using legacy checkout - using the new one...which I love!), and once he/she selects paypal and proceeds - is redirected to paypal. Upon submitting payment, the redirect comes back to our site, to an article which says "thank you for your payment". Again - in hikashop works great.
In Hika Auction, I have checkout setup as newer one (not legacy), but when user selects paypal and proceeds, they are not directed to Paypal...instead, they come back to the "thank you for your payment" message on our site. In the backend - the item shows as created.
Maybe it's a bug? In any case, for now, I removed the redirect url, and that way the user gets to Paypal. Hopefully this makes sense Thanks for great products!