I am working on a Magento store V. 18.104.22.168 that does the following error:
On onepage checkout.
Customer clicks on "Place order"
The button becomes disabled, shows a spinner (all goood so far).
Button goes back to normal. Nothing further happens.
The order gets created in the backend AND the customer's Credit Card gets charged. If the customer clicks again, another order gets created and his/her card gets charged again.
Does someone know why this happens?
According to the store owner, the store worked fine until a week ago when this error started to appear.