Ovulation Tests not matching...ugh😕

So on Thursday I used a test strip and the digital clearblue opk, the strip had 2 dark lines but the digital said low. I tried yesterday with similar results, only a much lighter second line this time. This has just been a very weird cycle as my period was 3 days late and I thought ovulation would be a bit late but it wasn't this time. We're going to try Chlomid again next cycle so hopefully it won't be as crazy next cycle. 😜 Has anyone else had a similar experience? I usually get positives every month with no problem which makes this all the more weird.