Because the coffee is burnt.
Before we got our robotic coffee machine, we had a simple carafe brewer with a hotplate. We had the same problem, and sometimes people would leave the carafe on the plate with no coffee in it making the carafes almost impossible to clean.
Our solution was to purchase a few of those pump thermoses, and leave the hotplate off. One would brew the coffee and once brewed pour it in the thermos. If a thermos was empty or almost empty someone would make a new pot.
In addition to the carafes being easy to clean, we had hot unburnt coffee all day,
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