One of the reasons why your bangs are acting up could be that you need a trim. Either give your hairstylist a call, or consult with them on how you can do this at home.
Try: Elfina Hair Cutting Shears/Scissors and Professional Barber Thinning/Texturizing Set, $14.99
Your forehead may also be the culprit why your bangs are getting funky — you see, an oily forehead may cause your bangs to separate and lay flat. Make sure to keep your forehead (and by extension, your bangs) oil-free by using blotting paper during the day.
Try: Tatcha Original Aburatorigami Japanese Blotting Papers, $12