Ovulation test help!

Hi! I’ve been trying to conceive for a while now and I’ve recently switched to one step ovulation strips (I have pcos and have also been using clear blue digital tests) and I am post ovulation according to the digital by about 4 days but I used the strip today and it’s come up with a weird colour and I’m not sure what it means? The test line looks almost black and the red line behind looks super faint! Has anyone else had this happen and what does it mean?