Text Label showing the expression of another Text Label... why?

This is happening to me in a lot of pieces: i’m showing this one ‘cause it is a simple one.

This is a piece with just to Text Labels, one to show and edit a Global Property, and the other one with some icon and some numbers. Here’s how i’ve made it:

The first label is pretty simple:

The second one shows some icons and text:

When i reload a game, or update the pieces, the piece show two identical lines, with the icons and the numbers.

If i edit the label, the defaul text is the expression of the other one:

Why this happens? How should avoid that?