remove products from incorrect auto collection

[exhaustfactory]

I have 3 categories  Remus Car Exhaust, Remus Bike Exhaust and XForce Exhaust. 

I have products for the vendors appearing in the wrong category/collection. 

for example I have auto collection XForce appearing on product listings that have vendor Remus car exhaust.  There is no tag referencing XForce.  I have set up the Remus Car to include entries with vendor Remus car, tag remus car, tit