Weird second dye pass on HCG AND OPK

Hey ladies, this is my second month tracking my ovulation with easy@home brand OPKS. i also got some HCG tests as well. I randomly took both an ovulation and pregnancy test today (dont ask why, just felt like it) i had already ovulated 7 days ago and i knew it was too early to take an HCG test. Anyway, i dipped both tests in the same cup pf urine for the recommended time. I watched the dye run across both and the 2 lines appear on the OPK and then one line appear on the HCG test. But whats weird is about 2 minutes later a second pass of dye went over both tests. This hasnt happened before and i took a ton of these exact OPKS last month and HCG as well. Is this normal and im crazy? Or is there something wrong with my tests. Thank you.