Multimedia keys not functioning properly

Some of my multimedia keys specifically f4-f6 are not functioning as previous song, play/pause, and skip song accordingly. Other multimedia keys such as f1-f3 work fine which are mute, volume down, and volume up. I have found that when I press [atl]+[f5] the play/pause works and [alt]+[f6]  skips to the next song, and [atg]+[f4] closes whichever window I am currently in.

I have a Inspiron 7548 that is running windows 10.0.14393 build 15393 any ideas on how to fix those 3 keys functionality?