@Sergio-Albuquerque I don't think that Music Maker can influence Samplitude in this way. You can try to reset the program settings to their default behaviour via the Help menu. Maybe this will help.
I wanted to believe Music Maker didn't affect Samplitude but I have been using Samplitude since 2013 (maybe) and the problem started the moment I installed Music Maker, hehe. - I don't have Music Maker installed on my PC anymore -.