Are you chirping or squeaking?

Squeaking is usually caused by the reed not being flat. It may not be flat in the first place, may have deformed after absorbing moisture, or formed to the shape of the mouthpiece window. Switching between mouthpieces, or moving the reed, makes this issue even worse. The solution is to flatten the bottom of the reed with a reed knife, Grobet "0 cut" file, or with sandpaper on a flat surface.