Glow Peak Day Confusion

Jenn
I'm 36 and TTC for our first for 6 months and started using Glow 2 months ago but plugged in all my historic period data for this year. 
My period is every 27/28 days like clockwork. This month Glow has predicted peak days on CD's 14, 15, 22 and now 23 which is today. Glow's last alert today says I'm likely ovulating today. Im a little confused. Anyone else experiencing this too? 
Now I've never gotten an absolute positive OPK but it gets very dark on CD 13/14 which also seems to match BBT
Thoughts from anyone?