Ovulate twice in a month ?

chloe • Mom of boy 13 years old

Hi , i have 2 apps for <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>, and what I found is very confusing. This app telling me that I had ovulation September 3, and next ovulation September 29. Other app said once in a month. I entered the same dates for period and the rest log for both. Does anyone had the same issue with Glow ?