I haven't heard of it before, but it doesn't surprise me that it happened. I put on a coat of Future *before* the decals go on. The Future provides a nice glossy surface to which the decals can adhere. After the decals dry, I seal the model with a couple of very light coats of clear flat paint. Did you apply the decals to a surface painted in flat colors? I learned the hard way that decals do not stick well on anything but glossy surfaces.
Hope this helps!