What on earth is this result?

I took this test at 6:17. At 6:19 I checked the test and a clear positive was there. I grabbed my phone, checked a text from my husband and replied, and then pulled the camera up at 6:22 - as I'm trying to get the camera to focus, the line is disappearing!! Fully disappeared by the time my camera was focused & now I'm clear as day seeing the test line underneath where the pink positive line just was!! What the f?! The instructions also say a negative result will disappear after 10 minutes, a positive result will stay for 48 hours - It's been 21 minutes and the pink control line is still very visible as you can see. I have no more pee in me, so now I have to wait a few hours before testing again. 😭😩 Has this ever happened to somebody before?! What do you think?!