Evap line on FRER?

Has anyone here experienced evap lines on the FRER tests? I dismissed the test as negative but when looking at it again I swear I see a shadow of a line on 3/3 of the tests. Admittedly I took them like a week ago so they are definitely invalid and digital is saying not pregnant so I was just curious as I thought FRER rarely had evaps - pics of two of the tests in comments with inverts

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Did a line show within the 3-5 min timeframe? If so I’ve heard it’s positive. If it’s sat after 10 Min then evap. Always throw away after the 10 min. I can see something but I can’t tell if it is color or not

I can see it in the top photo and the bottom inverted. If it's within the time frame they're positive. X

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