Sounds like a fraud on your account. Call Apple Support direct immediately to report it. Do not erase or alter any information until Apple can assess the situation - it would be worth checking your account details to see if you were charged for the purchased Songs - if so, change your password on your account immediately.
I checked my "purchases" and the 7/19/13 purchases don't show up. However, the earlier versions from usually several years back...the ones that are Matched...often do show up in my Purchases. I suspect that somehow those REALLY purchased several year old versions were deleted and redownloaded by me so I could change them to the 256 kbps versions under iTunes Match. They were probably 128 kbps versions originally when purchased.
Why the earlier versions that were really purchased are now identified as Matched is puzzling.
Why I now have Purchased versions from 7/19/13 is puzzling too...especially since these versions do NOT show up in my purchases.
Calling Apple Support if a good idea unless someone can explain this mystery. I might even take one of my laptops to the Apple store and show a Genius.
Thank you very much for taking the time to respond, Mr. Luigi