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Max Stack Usage Reduces

Hi I am a newbie in embedded development, I have a question about Stack usage watermark feature.
I enabled this feature to have a look at the max stack usage, So for e.g. just when the debugger is started the main thread showed current 6% and max 43%, just a few seconds later the max usage drops down to 6% (current shows 3%). And I am sure that there is no reset occurring. Can someone please explain the drop in the max usage?