Light bug on object in game

Hi, I am new to making Sims 4 props. I made this tea cup to start with but I am getting this weird light/color glitch in game? It doesn't mather if I rotate it, it still looks like different colors on each side of the handle. Doesn't look like this in Sim 4 studio, only in game, both indoors and outdoors. 
What am I doing wrong?