OPKs darker than usual.

So why are my opks seem to stay dark? I see other women's and they're super faint then get REALLY dark (normal I know) but get faint again. Posting what I thought was my LH Suey that occurred last Wednesday on CD 19. I'm now CD24 and decided to

Test to see what my baseline was (first month using cheapies and pink dye OPKs) and it's still pretty dark?? I know it's negative. But it's also not super faint. Is this normal?

^^ last week. Bottom two were the same urine and looked like a surg. I stopped testing after this

^^today. Still pretty dark right? Not faint. Did I miss it? Should I have kept testing? I mean CD 19 or 20 to ovulate seems late.