How to initialize once a masked block

I have a masked block in which I add in Initialization pane the following initialization code:

    disp('init')
    myFunc();
    disp('init end');

In myfunc() I have:

    disp('in')
    % other stuff

When I open my masked block, change some parameters, then press Apply or OK, the MATLAB console prints:

    init
    in
    init end
    in
    in
    in
    in

The first three lines are as expected, but do you know why all those extra calls are done, and from where they come from ?