Hello Alessandro,
It seems that your gallery show the records but that you did not connect your data to the different elements(text).
You can do that by selecting the element in your studio pro and add the right attribute to the element.
Take a look into this learning path :
https://academy.mendix.com/link/modules/718/lectures/739/-4.4.3-Display-Dynamic-Data-with-Parameters
Hope this helps,
Good luck!