dbclean vs flood shutdown

Last night I started a job running to load some checksums into a DCC 
server
which I wanted to check before allowing them to flood into the rest of 
our
network (this is on a private DCC network). I sent the sever a flood 
shutdown,
started the job running and went to bed. When I woke up this morning I 
found
that the server had run a dbclean during the night and once the dbclean 
was
finished the server restarted its floods.

This wasn't what I was expecting. Does dbclean reduce the count of 
reasons
not to flood by 1, or reset it to 0?

Bernard.