Hello Zulman,
After taking a look at your project, I found that this is working as intended. I have provided a an example below to help explain the issue that you are having.
Example:
Both images are 3D widgets in game. I placed a block behind them to help show the difference. The original in on the left and the altered version is on the right. What I did to achieve a more crisp look was increase the draw size of the widget and scaled it down.
As you can see here the widget on the right is much larger. This means that when I bring it in to the world as a 3D widget I can scale it down to the size I need. This will leave it much more crisp. If it helps you could think of the size of the widget as you would any texture. By this I mean that if you take a really tiny texture and blow it up you will have the same sort of fuzziness.
Make it a great day