Invoice Content varies between OC invoice and Paypal

I'm using OC 3.0.3.2. Paypal Standard (Not Express)
Open Cart order invoice content and total is different from what sent to Paypal for the same order. Example: Same order number #12345 on both OC invoice and Paypal, however the order content(products and total) is totally different. It super issue, i have no idea how this happened or if there's a bug.
How can we fix this?
Thank you,
Danny

How different and how often does this occur? Check the order tables from PHPmyAdmin, maybe your auto-increment is messed up and pulling in past orders. I have seen similar cases of mixed data, usually happens when people import existing data, but don't initially truncate all the proper tables.

Was this a fresh install?

Thank you for your time.
Here's the sample order:
Same order #152 both OC Invoice and Paypal.

OC invoice: ABC x 2 pcs($20 each) and CDE x 1 ($40) total $80.00
Paypal: EFGx1 ($80) and XYZ ($40) Total of $120. Payment received amount $120.

I don't have the issue with increments.

Yes, it's fresh install.

Thank you.

You need logs to see what's happening between the session data and the callback. PayPal standard is pretty straight-forward module, consider posting a commercial request if you are unable resolve this.

Try running through the checkout reach the confirm section and look at the missing orders. See if that data matches up to what's in your cart.