Ovulation day

My hubs and I have been TTC for 6 months now. I am new to glow. I am trying to track my ovulation day and I used an opk and it came back positive in January 22. I put that in glow but it didn't change that to my ovulation day. I keep putting that I'm taking one each day and it's negative but glow keeps pushing my projected ovulation day back. Why wouldn't it accept the positive ovulation on January 22nd?  Anyone else have this issue?