OPK states high fertility for 10 days?

I recently had my IUD removed in October and since then, I haven’t had a regular cycle. So mid February, I tried the clear blue advanced digital opk and tested every other day until it came back with something. It’s been saying that I am In high fertility for 10 days now and haven’t reached peak fertility yet. The box says if you experience 9 days of high fertility to stop testing. But has anyone else experienced this? Do you know why it would give these results?