Sort of confused

So I got my period September 13 (2 weeks late). I did my ovulation tests October 1-5 all 100% dark and possitive. According to Glow, I'm 6 dpo and am due for AF 10/16 and I didn't ovulate when my tests showed I was.. I guess my question is, if all tests were no doubt about it positive, when did I actually ovulate? 
​So confused