Stereo Glitch? [solved]

One of my Sims had a gifted stereo in his inventory that I didn't want since they have a better one already. So, I took it out of the inventory and tried to place it on the ground outside and then I was going to go to buy mode and delete it but when I tried to place it on the ground it just disappeared. Then I keep hearing the stereo music playing all the time and when my Sims go outside they get the enjoying music on their panel but I looked around for it outside the house and couldn't find it anywhere and the other stereo was not on. Then later the stereo that was in my Sims inventory reappeared back into the inventory. I placed it on the ground and deleted it in buy mode but I still keep hearing stereo music playing even though it wasn't on and neither was the one they have in the house. It's not a big deal but it is a little bit annoying to have an unidentified stereo music playing all the time on the lot that I can't turn off. I guess if there is going to be a glitch here and there it's better that it's a minor one and not a really bad one. Has anyone else had this weird stereo thing happen in their game?

Update: Thanks for the help about this glitch. I didn't end up needing to move the family out and back in as was suggested. One of my Sims was having a Birthday and the screen zoomed in when they started having their Birthday. I zoomed the screen back out and suddenly I was able to see the stereo on the ground outside that was causing the glitch. I was able to go into buy mode and delete it after I turned it off. I thought that only one of the Sims had one in their inventory but I found another one in one of the Sims inventory so I think it's possible that more than one Sim had the same stereo in their inventory and one of them caused the glitch. Anyways, the glitch is gone now.