BFP ONLY when I dilute with water.

Hello, anyone experience bfp when they dilute sample with water or naturally diluted. But bfn when more concentrated?

** I had vvfl on a no hold diluted natural sample. I don’t even know why I decided to test with a no hold diluted sample but I did and got a vvfl. That’s what made me think to experiment tonight. Please share your stories, you have experienced or heard of. I appreciate the comments because this is different.

I do have a theory. Thank you

1st pic diluted 4-5mm. 2nd pic UNdiluted I took about 30mm ; only took pic now for comparison for this post. both from same sample