1st timers usually drop eggs, so if that's the case it is to be expected. Also if water params are off, eggs can be dropped.
There are some sellers that sell blue rilis as BV. Heck, I've even seen blue pearls being sold as BV. Problem is some sellers go by what the shrimp LOOK like and not the actual genetic background. Unfortunately doing this screws not only the buyer, but anybody that buyer may eventually give shrimp to.
Yet another reason to buy from a shrimp forum. Most of the time the shrimp sellers are hobbyists themselves and know the genetic background.