The stickers theme is probly playing because you have it on event
To fix the audio messup on my part, you can simply add 3 frames right infront of the layer that has the audio in it, This will push the music audio all back by 3 frames and make it catch up to the lag. (if 3 frames is not enough, do more, but no more then 6)
If you have any AS qustions that cannot be answered, just ask me, and i may be able to help. (by asking someone who is an AS god to help)