Red circle (light / flare) when getting close to dark subject

[iWillLift]

Hey all:

I run into a little issue today and can’t figure out the root cause.

I have the a6400, when I get close to a subject, mostly black / dark fabric type of material, I will see a red dot (light / flare) on the subject, as I move further, it turns into a circle, and it stays on the final shot.

It happens with both the 35-50 kit lens and the sigma 16mm,

It’s also not Focus Illuminate, I tested with it turned off and issue persisted.

Any idea what this could be?

 

Big thanks for looking into this!

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