Why is my FB Pixel showing inaccurate purchase data?

Hello. I have trouble with the fb pixel, I have 0 purchases on shopify but in my fb ads campaign it shows 10 and good metrics too. I talked to fb business support team, they sended me back an email but still nothing fixed. I have this issue for almost a week and really don’t know what should I do anymore. Thanks a lot, here I will leave some pictures.