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TPS3813-Q1: WDI related

Part Number: TPS3813-Q1

Hi expert,

My customer meet a question during testing. The description as below. 

Window and boundary time configuration: WDT and WDR short to Ground

Question: 

You can see below picture. They set Tp to ~100ms, there have two different phenomenon if Tw=400us and 1ms. When Tw=400us, it will occur reset signal around 250ms period, it seems 3813 trigger watchdog timeout. When Tw=1ms, there will not trigger timeout, no reset signal. 

From my understanding, 3813 only recognize the rise edge, do not judge the high level time. So why has different phenomenon if just change the high level time? 

Thanks!

Ethan Wen