Input delay dependent on the source resistance and level
R57 value (220R) was too high, causing integration of the input pulses on the input capacitance. As a result, the input time offset was dependent on the amplitude/resistance of the trigger source.
Fix: use smaller R57 value - tested with 22 ohms (large enough to limit clamping diode current to 1A without significant integration).
To be included in EDA-02267-V4-1.