To me, it looks more like a “race condition”. The web site is “multi-threaded”. A request gets sent to the server, and while the browser is waiting for the reply, you’re clicking different things and thus send further requests, and somewhen the replies come back to your browser, but not in the order you would need them.
From a software developer’s point of view, quite the naughtiest thing you could have to try to fix.
Because everytime you try to repeat the issue, a little different timig is required, and reproduction fails… And of course, it does also depend on the JavaScript implementation of your browser. Infinite number of combinations possible.
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