CB digital ovulation kit question

This is my first time posting. I just have a question to anyone using the CB obk predictors. I'm usually fairly regular, on a 31 day cycle, I started testing on day 11. Blank circle for 3 days, and now have had a flashing smiley face for 6 days. This brings me 20 days into my cylcle, which makes no sense to me how I'm A) still getting a flashing smiley and B) haven't gotten a solid smiley yet. Has anyone else experienced this? Thanks :)