Check google analytics ecommerce transactions

For a series of webshops with same template I have some problems:

- In Google analytics of one shop there are transactions of 2 shops instead of 1. In the other there are none.

- In most analytics I see a lot of transactions are missing....around 30%

I think this is easy for an expert, but please don't waste my time if you 'think' you can do it. I won't appreciate that at all.

And to all people who read: if you put 'vvw-hw' inside your reply....I will only view those.

Skills: Google Analytics, WooCommerce

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Project ID: #15103324