Sleepyhead Bugs!

Due to an artifact my data has been spoiled, is there a way of deleting a 20 second window of data so it can reset my report data? My Maximum pulse rate is saying 132.00 in my sleepyhead report which is way off the mark. Last night was some of my best readings so I dont want to delete the file. My usual pulse rate is between 30-70. Any help would be gratefull

Oh and one other thing will sleppyhead except my Resmed S8 data or will it only take S9?