I got Honda HRX last fall. In The fall used it twice and was very satisfied. This spring change the oil sharpened the blades. Because a lot of rain didn't mow for two weeks so had to go up a notch on the cut height from 2.5 to 3. Noticed grass stringers pop out after mowing and figured it was because grass was too tall. next week didnt change the height but got same problem. Any ideas as of why is it happening? Thanks.