So granted my temps have been all over the place but all my ovulation tests look almost identical to each other?

So I have long cycles, about 41 days usually and I o on cd27. Well we're going on cd30 and no o and seriously just about every single opk looks identical. I've been testing since cd12 (i once o'd cd20 so I test a little early) and I'm almost out... I'm using Wondfo... Has anyone ever had that problem????

And when I say identical I mean I usually don't even get a line at all some of the days leading up to o. Not one single blank one. They do get stronger and weaker but very subtly.