HVAC Fan Running

The other thing than can happen is that sometimes various electronics can interact...........I have not kept up with modern thermostats so I don't know "what they are doing," EXAMPLE

Some combo furnace/ central air systems have a delay in the controller so that the fan STAYS on for a PERIOD OF TIME after the compressor shuts down. This is to extract the extra cooling effect "left" in the evap as it is still somewhat cold, and also to dry it out

IF the stat has the same function, you may end up with the fan running for several minutes, after the AC has been satisfied or shut off