Line disappeared??

Livi 🦊

I just took this test. I thought it was a pretty clear positive. But now it’s been 12 minutes and I just looked at it again and it’s gone??? First picture is when I first got a + at the 6minute mark.

Second picture is what it looks like now at 12 minutes. Looks like a stark negative now. So??? Any experience with this? 😩 I’m 11dpo.