Grid is not shown if mapped with a REST Service

I searched in the forum but I didn't find this topic.
I made a REST service which receives a xml response from the server.
I added a Grid in my screen and put two labels in the cells.
After that I mapped the response parameters to the Grid and the labels, but .... the grid is not shown at all.

I inspected the HTML with firebug and I found that the table tag has the display:none attribute:

The html source code instead is:


Another thing is that although the grid's name is "mobilegridRanking", the class is set to "mobilegrid1", is it normal?

However, if I delete the data mapping between the Service and the Grid, the Grid is shown.

Here is the mapping:

And this is the server response:

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