php version is causing a lot of strange things but for this problem is responsible the payment module .
I have spoke to my programmer of the module and he is preparing an update because of the extra security .
i think the problem is with MASTERCARD and a new 2 factor transaction mode call ''Mastercard® Identity Check™''.
If you can test your modules with VISA cards you want have a problem .Because i have the same issue .Looking for sollution
do you have recatcha module configure in your prestashop installation?
In mine case that was the problem because it wasnt congigure the module and with debug mode the problem was found
Εμεις απο την αρχη θεωρούμε ξεχωριστα προϊόντα όταν αλλάζουν χρώμα και τα περναμε ετσι και δεν υπαρχει θεμα .Μιας και το barcode ειναι διαφορετικο εαν αλλαζει χρωμα