Having played with your XML export part of me thinks that cannot be the reason because I got the error and they were never duplicated on my system. However as it fixed it on your system that sounds like a very plausible answer. I suspect the answer is somewhere in that xml export but I just don't know where. Either way it gave me a good refresher on the OU combined question type which was very interesting.
Coding error detected: This question is of type that is not installed on your system
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