An issue with TouchScreen calibration of my TFT display mcufriend

Hi Everyone!

I have a 2.4 TFT touchscreen display mcufriend.

All works fine, except the touch functionality.
I am having an issue with TouchScreen calibration,
I calibrated the y axis without problems, but I'm not able to calibrate the X axis because it seems to be different for each side...
while being a coordinate it should be symmetrical on two sides..

I hope I was clear:)

Sorry for my bad english.

I uploaded a video of the problem to make you understand better:

https://www.make4future.com/2019/07/10/non-riesco-a-calibrare-il-touch-di-un-display-tft-2-4-touch-mcufriend/