While I have not seen the images of your affected discs, sometimes residue from the plastic disc cases themselves can transfer to the disc surface. This is a result of poor quality control in the injection molding of the plastic cases. In my personal experience, the white translucent cases do this more often than the blue or black cases.
The good news is that this residue will come off with a simple cleaning, but it may also return if you continue to use the original case. If the residue returns, or if you just don't want to potentially deal with this issue again, you can buy high quality replacement cases such as those made by Viva Elite. You can buy them at multiple online sites, including ebay.
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