Atari 2600 darth vader mod av NTSC collor with lack of colors

[GilsonAnimes]

I'm from Brazil and I have an Atari 2600 version rev G polyvox, the brand that produced the Atari 2600 in the 80s here in Brazil, I recently did the av mod and changed the crystal I had in PAL-M to convert to NTSC, the original standard American, however, when doing this, I felt that the colors were really vivid, but there was a loss of colors, for example, in the game Pitfall, the trees disappeared, leaving everything the same green, and in the enduro, in the snow part, the car simply disappears, I'm putting a YouTube video link that I recorded for better viewing, and I've also attached a photo of the motherboard, I don't know what it could be, I think it's some component that mixes the TIA signals, but I don't know for sure, I would be very grateful if someone could help me demystify this mystery of the absence of colors.
One final observation, the hue is calibrated, it was calibrated by the Color Bar Generator.

 

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