If you're using the one from the core, it's been deprecated last year; no longer maintained. I would suggest to use the PayPal Commerce Platform (free) from the Marketplace which is recent of only a year.
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
Programmer / Opencart Tester
The discount is usually included in the Shipping, Handling, Discounts & Taxes line. How are your totals set up and do the PayPal line items match your OpenCart line items at checkout?
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