I doubt there is any way to fix them. Fiber optics are long, slender length-wise strands, and they work best as one solid strand. Even if you glued them they probably won't gather light near as well. According to their website, they carry replacement pins. I assume you have checked the shop/store where you bought the site to see if they carry just the pins themselves?
http://www.toxonics.com/parts.html
--Man who fish in other man's well often catch crabs--