I'm so confused

Glow is saying that I'm supposed ovulate at day 16 and 17 and that my cycle is like 40 days long what a my doing wrong since when did you not ovulate it day 10 through 13 I have four kids and I've never had trouble as long as I hit it in the ovulation. Why is Glo telling me my ovulation. Is a week late and I've always thought and is a Cycle ever longer than 30 days it's saying my cycles like 48 days or something I'm totally doing something wrong