Sound playing through speakers when headphones are plugged in
Solution 1:
Try getting a compressed air can (from electronic store) and blow it out, also check the steps below are correct:
Click "Start" then type in Sound and select it from the results that you'll see
Once it's open click on the tab that says "Playback" then select your headphone from the list device showing in there
Click on "Set Default" then reload the video or audio you're trying to play.