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If you weren't running them at the same time and see the much higher values in one over the other than all bets are off. HR and RPE >>> (unless you're elite level and have previously been shown able to id load)
Check the PT calibration using instructions in the link above. If it's ok then check SRMs. If it's ok then maybe you were just fresh and your FTP is wrong.
So you have two power graphs for the effort? Was the PT higher for the whole thing?
What is it's calibration value? See: http://www.cyclepowermeters.com/powertap-garmin-calibration-check-76-c.asp