As to return the rewards into points rather than monetary values, this can be edited in your catalog/model/extension/total/reward.php file or by creating a new order total module. Extensions could also be found on the Marketplace about this.
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
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