blue/white screening - results are opposite as expected
Given the fact that the negative control uncut plasmids are producing white colonies, it seems that there have been significant mutations within the lacZ gene in the plasmid, causing the uncut plasmids to become white due to inactivation of the gene. 

I would suggest purchasing a new batch of pBluescript, or if that is not possible for whatever reason, perform a miniprep on one of the blue colonies and sequence its multiple cloning site to verify that the MCS is present and not mutated before continuing. If you are not going to buy a new batch of plasmids, it would also be prudent to verify the plasmid's length using gel electrophoresis.

The most likely explanation is that the plasmids are mutated, and therefore you are getting bad results in the blue/white screen.