you can't put the safety on unless the hammer is cocked,if your saying that with the hammer cocked the safety will not go up unless you pull the hammer back farther then the safety is not fitted properly
He didn't fit it right.
FWIW, Wilson has stated that their parts are not intended for Taurus 1911s. That's because the early guns (and maybe the current guns) had hammers, triggers, safetys and sears that were made to non-1911 specs. I've heard that has changed with the newer guns. I don't know for sure.
Take your gun back and have it fixed.