That would have had to have been ruger then because I havent touched it,
Wouldnt be the first time something got out of the factory that shouldnt have. It does sound like you have something that shouldnt be there too.
I had a S&W model 29 that had a super smooth DA trigger, and a super light SA trigger. Whoever fitted it went just a tad far, as you could put your thumb on the hammer and "push" it down when cocked, which is a no no.
No biggie, I dont shoot revolvers SA anyway. I filed the SA notch, as well as the hammer spur off, and shot as it was meant to be shot.