Fuse inside the fuse box gets really hot for power seats

My fronts Seats won't move, the fuse gets so
hot I blistered my finger after only running the
engine for a minute. I took the fuse and
placed it in the power windows slot and it
worked. So the fuse is good. The seat had
been moved forward for another driver, and
when I went to put it back it would not work
(2 hours later) any idea on what would cause
a fuse to get blistering hit and not work in the
position for the seats but would work in
another slot?