Small, white hair usually is belly fur from Rabbit, Grey Squirrel or Red Fox.
You mentioned Fox urine, so I assume you are trapping Fox.
Sprung traps and pull outs indicate problems with one or more--- pan tension, pan/dog adjustment, weak springs, improper bedding, too much trap covering, freezing/thawing conditions without freeze proofing set and so on.
Is there anyway to fix this problem or figure out why this is happening.
Yes. Problems can be solved. But first you have to figure out why.
Did you tune your traps? Did you bed traps solid? Questions you should ask yourself and go from there.
By that, narrow down your problem and we can go from there.