Plane Refusing To Climb after Constraint

  • Soo ihve noticed that on the a320 family, when i turn the managed climb and speed on, the plane will reach a certain waypoint with a certain altitude constraint and just holds there at that altitude even if i'm supposed to climb to an even higher altitude after passong that waypoint. The plane will just hold this altitude, it only climbs when I turn to open climb on and switch back to managed mode again, same goes for the b737 and VNAV, it won't climb to the next constraint after passing the current one, Imind you I set the cruise altitude on the MCP hence it has no restriction to climb but yet it still refuses to