OPK confusion help!

Ive been TTC for 4 months and had very regular cycles since coming off of the pill. The first 3 around 30 days and the this cycle was 28 days (more like my cycles before I went on the pill) I’ve been tracking with glow and Premom and was never a day late. It even predicted when my cycle changed to 28 days. But I’m a little confused with my opk from today cause it seems like I got a positive too early. I understand that my cycle changed but i still feel like CD10 is too early. Any insight will be greatly appreciated!

April First positive- CD14 (31 day cycle)

May first positive- CD14 (30 day cycle)

June first positive- CD13 (30 day cycle)

July first positive- CD10 (28 day cycle)