is it easy to unbundle them to test? or better yet, just attach the VGA without attaching the other 2 cables and see if you still have the problem.
my guess is however that you're getting reflection within the cables... was this a premium cable that you bought, or just some $20 cheapo one?
You might want to check here, for example, however unfortunately those things tend to be expensive for what they are. also, what type of LCD are you hooking it up to, and how much cable do you really need?