The first photo was likely taken by the same phone as Q's other in-person pics. The three 'known' photo were taken by a different phone or using different settings.
Q almost always posts 16 bit PNGs. Sometimes with an alpha channel, sometimes not. I don't know why this would sometimes be present.
Left is the upper 8 bits, Middle is the lower 8 bits. Right is the lower 2 bits normalize to a 8-bit range. Bottom half the two is the 16 bit alpha channel split up the same way (it's solid 0xFFFF).
These were taken by different phones or with different settings.