They may have gotten wet and warped as they dried, but the splinters suggest that they may have started breaking from being bent. :sad: I lost a set of plastic needles because one of my children stepped or sat upon my knitting bag. :doh:
If they are small diameter, then I'd just replace them. If your budget is tight and you have extra chop sticks, then you could make your own by sanding the chop sticks down to the diameter of your bent needles.
If they are a larger diameter, you might be able to sand out the splinters as you sand them to a smaller diameter.
Metal can bend too and plastic will bend and break also. I try to wrap my work around the needles before I put the UFO back in my bag. I am looking for a needle wrap for storing mine when they are not in use.
Good luck. Crossed Fingers [/COLOR]