Still Stumped

[Milfredo]

Each time the button is clicked in the set_calc_value it puts an entry on the screen below the previous one. The label is modified I thought. Uses same label with a different value. And the button in get_calculator only gets clicked once and then the window is closed until another factor button is clicked which opens the calculator screen again.

The calc_value I am having trouble with only appears in these three functions. no where else in my code.