Glow app

I'm confused. It might be an easy answer but I had to ask...
My glow app changes on me. Idk if that's what it supposed to do. I really just want to know when my fertile days were. My last period was on September 18th. According to my app, I ovulated around the 29th. I haven't gotten my period this month so I tracked it on Glow & now it's stating that I ovulated on/and around October 11th. Is that accurate? 

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