Why is my water pump running way after car is shut off

I noticed the "turbo timer water pump feature" thing running more than usual.

I drove it about 30 miles, and it ran normally, shut off after a few minutes.

Then it cooled down.

I then moved it into my garage, took literally 30 seconds of running. and the water pump was still cycling on and off, the coolant was at like room temperature.

What is happening?

bmw replaced my water pump 2 summers ago btw

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2008 335I 6MT - Alpine White/Coral Red; JB4 G5, MHD Flash, Wavetrac LSD, ST Coilovers, MMP Inlets, AA FMIC, BMS DPs Walbro 255 pump, E85, VRSF Charge pipe, Mtech front and rear bumpers, M3 side skirts, Toyo R888s, NT05R on Koseis

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Why is my water pump running way after car is shut off