I found the problem
I formatted the column with black borders like an Excel cell and this formatting is changing the format of the values in the field. If I remove the borders it works fine!!
this is the Json Code for the borders
{
"elmType"
"style"
"border"
"padding"
"box-sizing"
},
"txtContent"
}
Now I have to find a way to have the borders and the currency format!