Triathlon multisport FR255 + edge 530 double training load issue

I had a Triathlon event last sunday where I tracked the swimming, biking and running with my FR255. For the biking part I've also used my Edge 530 fot the live data screens and a more in depth (and somewhat  more accurate data) 'after race' analysis. Now I have got a very high (double?) intensity training load on my training status.+900 instead of +700. Is there any way to put the data of the 530 on non active without deleting the file? And why doesn't Garmin recognise these activities as both the same ones, excluding a double count?