'Create object' is a particularly old, reliable and well-tested part of the engine. It seems more likely you are making a mistake during the upload process than that there is an issue in Construct 2.
If you want this investigated further please provide a minimal project made from scratch - your project includes logic and many unnecessary objects that is not directly related to 'Create object'. If there really is a problem with that action, it should be provable with just 1-2 objects and 1-2 actions in the project. If that does not reproduce the problem it indicates that something else is to blame; following this process you should be able to post a new bug report that accurately identifies the real issue in C2 (if there is any) or point out your own mistake.