It's only my second cycle using OPKs but when I started I was desperate for any advice I could find!
During my first cycle I tested once a day from CD6 until CD10, then I tested twice a day until I saw my first High levels on CD19, followed by the peak on CD20, then another High on CD21 followed by low levels until AF came (I stopped tracking at CD22). My last cycle was at 33 days.
This cycle I started tracking once a day at CD9 and started twice a day again on CD11. Too early to test twice a day technically but I do it because I am still relatively new to tracking and I want to be sure that I am not missing my increasing levels. I don't know for sure if I will see a peak on CD20 again this cycle or not!
My point is, looking at your screenshot, it looks like you are consistently testing once a day. I'd recommend testing twice a day to be sure you aren't missing anything! Also, our LH levels are highest between 12:00 pm - 20:00pm, I can see that you are testing quite early in the morning. Not sure if you are able to test later during the day, I test at around 12:30 pm and 16:30 pm, but this was after some trial and error.
Of course, there might be other causes for example that you have a longer cycle this month but I am not a doctor and only providing speculation here. I know how frustrating OPKs can be so hang in there x