About a year ago I purchase a glacier bay tub and shower set. It has two handles, one for on and off the other for hot and cold. When initially install with a tub surround it worked fine, however recently I decided to remove the surround and tile. After tiling I replaced the handles, but I can’t get it to work. The on/off handle works but the hot/cold handle will only let cold water through, when turned to hot it turns off. What am I doing wrong?