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GT911 touch module not reading zero coordinates

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Hi,

I'm using the test example of the GT911 library:
https://github.com/TAMCTec/gt911-arduino

on my ESP32_8048S043 with 800x480 resolution, the code works and there're readings on the serial monitor. I can get the high values of x, y but the lows don't read zero or near zero, I get values +200. Like this:

Low x, y coordinate:

Touch 1:   x: 328  y: 220

High x, y coordinate:

Touch 1:   x: 795  y: 480

What could be the problem ?

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