My air leak numbers historically have ranged between 0 and 12 liters/min. On Dec. 4th the air leak jumped to 28, followed by leak of 20, 20, 6, and 19 liters per min on following days. The really weird thing is that where my air leak on Dec. 3rd was 4, it now displays 18 for that day. On December 2nd I recorded air leak of 5; Myair display now reads 13 for that day. On Dec. 1st I had 0 leak, but Myair display now says it was 13 that day. It's like the numbers changed randomly, but much higher. What happened?