Item selling for less

Hi! 
does anyone know why an item randomly sold for $4.95 less than it should have? 
thank you! 

More info needed...

 

Perhaps an offer??? eg. item price $49.50... 10% off would equate to $4.95

 

Without the relevant details, any possible explanation you receive here will be nothing more than a guess 

Thanks for the reply, the item is listed at 19.95 and the sale came through as $15 even. I do have volume pricing on, but this person only bought 1 item. 

What’s the item number?