did it come back over night/next day?
or a few weeks/months later?
if the former, you didn't flush the spill/spot out well
(easy to happen because many of those spots/spills disappear after a minute or three pre-spray dwell)..especially on oli berber
and we just don't think to flush/rinse/dry stroke a little better in the spot .
toss pocket change coins down on those spots so you know where more attention is needed when you get there with the wand
if a recurring spot that appears weeks/months later, you can put pixie dust gunk on it as Scott suggests
or you can dispense with halfazz smoke n mirror hiding juices and attempt to do it right, by flush/rinsing all the foreign crud from base of fiber and top side of backing
.L.T.A.