Ovulate late? PLEASE HELP

Shay

Okay first I always track my period and when this app says I am suppose to start my period, I start that day. I am suppose to start on the 11th but it just jumped to the 16th

This is my first time taking ovulation with sticks it said that I was suppose to be fertile on 20-27 I just randomly tested and had a positive am I ovulating late? Is this why my period on the calendar moved the dates? Please help