Thanks for reaching out to me here in the Intuit Community, @hello14.
Let's get rid of your duplicate transactions posted in QuickBooks Online.
If you've already added those transactions on your register, you'll need to manually delete them. Otherwise, you can exclude them on your For Review tab.
To learn more on how to remove duplicate transactions, you can read through this article: Remove duplicate transactions or personal expenses from bank feeds.
I also suggest reaching out to your POS provider to see if they can remove duplicate transactions prior to syncing with QuickBooks.
If you have any other questions, I'd be happy to answer them. Just leave a comment below and I'll get back to you.