A half step too high

The third string on my new acoustic-electric ukulele just would not stay at Bb. I even tried changing to a wound metal string instead on a nylon one but the same thing happened. So I took all four strings down one half step. The string seems to hold OK there. I'm now playing all my songs a half step lower because of this change (I also made the change on my acoustic one at home). This actually impoves my ability to sing a few songs and doesn't seem to harm the others.