Can you please provide some more information? For the moment we are not able to fully understand your request. If appropriate, you can attach some screenshots to better illustrate, what exactly you mean. You can also grant access to your admin so we can check your configuration.
Whilst uploading products, they tend to double and there is no consistency in the way to do. Occasionally it happens immediately after uploading but sometimes after a prolonged period. The same issues arises whilst adding new manufacturers. We have not managed to discover the cause of the issue yet.
We’ve checked your configuration and found nothing unusual. Generally theme does not alter the product adding functionality. In fact BurnEngine does not modify any default admin feature. The only thing that might be a problem in displaying information correctly is the database cache.