Red color in the middle of the image

Hey, I have this Arducam pi camera:
used camera

I am working on a Raspberry pi 3 and the problem that I have is that when I capture an image of a white surface (white paper) using a Neopixel RGB of LEDs to create a white light or just ambient light (2700K), I observe a red tint in the center of the image captured.

Only ambient light:

Only white LED light:

I found in other forums that this is a frequent issue, but i am not sure what is causing it and how to solve it. Is the cause of the problem a bad tunning of the awb gains or the lens shading table? Should I follow this arducam guide?

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