Ineffective trigger, the always missed sign

Yellow curve: Pressure (cmH2O) on X-axis and Time (seconds) on Y-axis Pink curve: Flow (L/sec) on X-axis and Time (seconds) on Y-axis Green curve: Tidal volume (ml) on X-axis and Time (seconds) on Y-axis Orange curve: Esophageal pressure (cmH2O) on X-axis and Time (seconds) on Y-axis The blue arrows point to the inspiratory effort on flow and esophageal curves that is not followed by a breath