It happened with my BB , when changing setting, I opened door put on setting @1 closed doors making sure not to over tighten, opened doors put on my setting @5 closed an was back to normal.

If do not open easily, then dried soap is clogging a bit. the knob must turn easily without any resistance,. Soak in hot water(not boiling) then rinse with pressure down barrel, let dry, then spray down barrel with WD-40, open and close till doors open and close with ease.

If it is still out of line or off then it is in need of repair