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LM2903-Q1: comparator threshold level question

Part Number: LM2903-Q1

Hi Sir,

My customer is designing LM2903-Q1 as below schematic,

When they define  PHASEU_OC_4V5 = 4.5V as below waveform#1, when the Input signal arrive 3.9V will make the output change from High to Low.

When they define  PHASEU_OC_4V5 = 2.83V as below waveform#2, when the Input signal arrive 2.7V will make the output change from High to Low.

May I know the reason why the comparator input not reach the ref level in pin3 but it will trigger to change the status from high to low?

Could you please help to explain on it?

Thanks

Waveform#1_yellow=input, Blue=PHASEU_OC_4V5, Red=output

Waveform#2_yellow=input, Blue=PHASEU_OC_4V5=2.83V , Red=output