Could someone please explain this ? I am sooo confused

StarDust

My period was projected to start February 1st but did not come. I had sex unprotected on the 12th of January, protected sex on the 20th and 25th, and unprotected on the 28th. Why is the app projecting my start date for the first of February if my average is 38 days according to the app. I provided a picture below.