10% of users click on the links twice

I have a very distant relationship to user interfaces, but it turned out that our product became an unwitting participant in a social experiment, the result of which I want to share with you.

One of the major online stores developed by us on the basis of Magento Enterprise, has been released. A week after launch, we began to receive complaints from visitors who had duplicate order information. I will not go into the technical details of the problem, but its solution was not at all as obvious as it might seem.
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No programmer was able to reproduce the error. There were a lot of potential sources of the problem, and we have long and unsuccessfully (if you can call it unsuccessful, their serviceability :) checked all modules. And only after analyzing the server logs it reached us.

As you might have guessed from the name of the topic, the source of the error was a banal doubleclick. As our sample shows, 10% of users clicked on the link twice. For obvious reasons, no programmer managed to reproduce the bug. And surely no one would have thought that the problem was so high-level :) Why such a problem became possible in principle is a topic for a separate topic.

Indeed, people not belonging to generation Y have a discord between the interface of the operating system and the interface of the browser window. As a result, 10% of customers click on the links of the online store twice. But it is not in Russia. I think that in Russia the percentage will be much lower, but not due to the general computer literacy of the population, but due to the weak development of e-commerce and the mistrust of generation X representatives to online stores.

PS I read the comments and it was funny. They already accuse programmers of lack of professionalism, etc. However, I do not specifically describe the details of the problem in order to avoid offtopic. And the problem is quite specific and uninteresting. But in the comments, double-prevention prevention specialists have already determined that our order is made by simply clicking on the link and that our competence is slightly less than zero.
Thanks for the comments :)