Thanks for posting in the Community. I'll be glad to share more info about Shopify transactions.
I'd like to know more about what's going on. How are you syncing your Shopify transactions with QBO. Are you using a 3rd party app? If so, which one are you using? I recommend clearing cache and cookies first to determine if this may be a browser issue. Give this a try and let me know if you're still missing transactions. I'll be on standby.
Good to hear back from you. There may be some issues with the app syncing with QBO. I suggest reaching out to the 3rd party app's support team. You can also call our Support Team at 855-253-1536 so an agent can share your screen and see what you're seeing on your end. Feel free to ask questions.